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6 Ways to Convert String to Float in Python

  • Aug 31, 2021
  • 7 Minutes Read
  • By Shivali Bhadaniya

6 Ways to Convert String to Float in Python

When you take a user input in python programming while working with terminal or file operations like reading or writing a file, the input is a string object. Even though you ask for the floating-point value, the input method in python will fetch the user input as a string object. Hence, you have to explicitly convert the string into a floating-point value so that you can perform the necessary operations on it. Before understanding the methods to convert the string to float explicitly, let us first go through the strings and float data types in python.

What are strings in python?

A string is a series of characters inside the quotes. You can use single quotes or double quotes to display the string. Also, triple quotes are used to display the multi-line quotes.

As you know, that computer does not deal with characters but instead, it works only with binary numbers. Therefore, the characters you input in the system are converted into a binary format using the encoding techniques like Unicode and ASCII. In python, the string is a sequence of Unicode characters which include every character and symbol in all languages. Square brackets are used to access the string elements along with the index position of the string character. The indexing of character in a string starts from ‘0’, and therefore, the string's first character always has the index equal to zero.

For Example

What is Float in python?

Float is one of the data types of python programming that is used to represent the floating-point number. Float is always written with the decimal points by dividing the integer and fractional parts. IEEE 754 standard represents the float as 64-bit double-precision values. Therefore you can say that the floating-point numbers are represented internally as binary(base-2) fractions. The maximum value of any floating-point number can be approximately 1.8 x 10 308 . If any number is greater than this, you can indicate them by the string ‘inf’ in Python

  

Convert String to Float in Python

Below are 6 common and simple methods used to convert a string to float in python

1) Using float() function

You can use the float() function to convert any data type into a floating-point number. This method only accepts one parameter. If you do not pass any argument, then the method returns 0.0. If the input string contains an argument outside the range of floating-point value, OverflowError will be generated.

If the input string contains anything other than a floating-point representation of a number, the output will be ValueError. Let us understand this in detail below.

2) Convert a Number String with commas into a floating-point object

Consider that the input string is ’1,0.123'. As you can see, the string contains numbers, but it also has a comma in it. Therefore, converting this kind of string into a floating-point value is very tricky. If you directly call the float() method, then the output will raise an error.

You have to remove all the commas from the string before calling the float() function to solve this issue. Take a look at the example below to understand better.

3) Convert string to float list in python

In this method, firstly, you need to initialize the string, and later, you can use the float() and split() method to convert a string into the floating-point list, as shown below in the example.

4) Convert a list of strings to float in python

The list of strings is the python list containing all elements as strings in it. To convert this list of strings into floating-point values, you have to use for loop to iterate through each item of the list. Later, you can use the float() method to convert each item into float value and then append it to the list again. Check out the below example for reference:

5) Convert String to Float using Numpy

Numpy is one of the libraries for python programming, which supports large, multi-dimensional arrays and matrices to perform high-level mathematical operations. If you want to convert a string into float using NumPy, the first step will be to import the NumPy library using “import NumPy as np.” Later, you can use the “astype” method, an in-build method used to convert the string to a floating-point value in python.

6) Convert String to Float with Specified Decimal Points

It is often necessary to bring the precision for the number of zeros after the decimal in floating-point values. In such cases, you can use the float() method to convert a string into float value and then use the format() method to specify the number of decimal points in the float value. The syntax of the format method is as given below:

“{:.Nf}”.format(float value)

Here, N displays the number of decimal points you wish to put. If the floating-point value generated has fewer decimal points than the suggested, then zeros are added at the end to round it. Take a look at the example below for a better understanding.

Conclusion 

While programming, there are many situations where you have to convert one data type into another to perform the necessary operations. This article refers to the python string and float values in detail and the explicit methods used to convert strings into floating-point values. As the input method in python accepts the string object for user input, it is necessary to learn and understand these methods to convert the string into float data type to perform different operations on user data.

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Convert a String to a Float in Python: 3 Easy Methods

Python script converting a string to a float emphasized with numeric conversion symbols and float icons symbolizing precision

Are you wrestling with the task of converting strings to floats in Python? Python, akin to a proficient mathematician, is fully equipped to convert strings into floating-point numbers effortlessly.

This comprehensive guide will walk you through the process, introducing you to both basic and advanced techniques. By the end of this article, you’ll be able to handle this common Python task with confidence and ease.

So, let’s dive into to String conversion in Python!

TL;DR: How Do I Convert a Python String to Float?

You can convert a string to a float in Python using the float() function and the syntax, number = float(data) .

Here’s a quick example to illustrate this:

In this example, we have a string '123.45' that we want to convert into a float. By passing this string into the float() function, Python returns the floating-point number 123.45 . We then print the result to confirm our conversion.

If you’re interested in diving deeper into the topic, understanding potential pitfalls and learning about more advanced scenarios, we encourage you to continue reading.

Table of Contents

The Basics: Strings to Floats

Handling exceptions with conversion, alternative conversion methods, solving errors within conversions, explained: string and float data types, practical uses: strings to floats, recap: convert python strings to float.

The float() function in Python is a built-in function that converts a number or a string to a floating-point number. Let’s break down how it works with strings.

In the above example, the string '456.78' is passed into the float() function. Python then converts this string into the floating-point number 456.78 . The result is printed to confirm our conversion.

The float() function is straightforward and easy to use, making it the go-to method for converting strings to floats in Python. However, it’s important to be aware of its limitations.

If you try to convert a string that doesn’t represent a valid floating-point number, Python will throw a ValueError .

In this case, the string 'Hello, World!' is not a valid floating-point number, causing Python to raise a ValueError .

When using the float() function, it’s crucial to ensure that the string you’re trying to convert is a valid representation of a floating-point number.

As we progress in Python, we often encounter strings that may not directly convert into floats using the float() function. This is where error handling comes into play.

We can use a try-except block to handle potential ValueError exceptions that might arise when a string cannot be converted to a float.

In this example, we attempt to convert the string 'Hello, World!' to a float. Since this string does not represent a valid floating-point number, a ValueError is raised. However, our try-except block catches this error and prints a custom error message instead.

Localized Formats

In addition to handling exceptions, it’s also important to consider different formats when converting strings to floats.

For instance, some locales use a comma as a decimal separator instead of a period. In such cases, we can replace the comma with a period before converting the string.

In this example, we replace the comma in the string '123,45' with a period, resulting in the string '123.45' . We can then convert this string to a float using the float() function.

By understanding how to handle exceptions and different formats, you can convert strings to floats in Python more effectively and avoid common pitfalls.

While the float() function is the most straightforward way to convert strings to floats in Python, there are alternative methods that you can use, especially when dealing with more complex scenarios or larger datasets.

Let’s explore a few of these alternatives.

Using Pandas Library

The Pandas library is a powerful tool for data manipulation in Python and can be used to convert strings to floats across an entire DataFrame or Series.

In this example, we create a Pandas Series with strings representing floating-point numbers. We then use the pd.to_numeric() function to convert these strings to floats.

This function is particularly useful when dealing with large datasets, as it can convert all strings to floats in one go.

The downside of using Pandas is that it’s a heavy library and might be overkill for simple tasks. It also requires you to handle NaN values and decide how to deal with strings that cannot be converted to floats.

Using Numpy Library

Numpy is another popular library in Python that can be used for numerical operations. The numpy.float() function can be used to convert strings to floats.

In this example, we use the numpy.float() function to convert the string '123.45' to a float.

Numpy is a lightweight library compared to Pandas and is a good choice for numerical computations. However, like the float() function, it will raise a ValueError if the string cannot be converted to a float.

While the float() function is the most direct way to convert strings to floats in Python, libraries like Pandas and Numpy offer alternative methods that might be more suitable depending on your specific needs and the complexity of your data.

When converting strings to floats in Python, you might encounter a few common issues. Let’s discuss these problems and their solutions, and delve into some practical examples.

Handling ‘ValueError’

One of the most common errors you might come across is the ValueError . This error is raised when you try to convert a string that doesn’t represent a valid floating-point number.

In this example, we tried to convert the string 'Hello, Python!' to a float, which resulted in a ValueError . To handle this error, we used a try-except block to catch the ValueError and print a custom error message.

Dealing with Different Formats

Another issue you might face is dealing with strings in different formats. For instance, some locales use a comma as a decimal separator instead of a period. In such cases, you can replace the comma with a period before converting the string.

In this example, we replaced the comma in the string '123,45' with a period, resulting in the string '123.45' . We could then convert this string to a float using the float() function.

By understanding these common issues and their solutions, you can effectively convert strings to floats in Python and avoid potential pitfalls.

To fully grasp the process of converting strings to floats in Python, it’s essential to understand the fundamental concepts of strings and floats.

Python Strings

In Python, a string is a sequence of characters. It is an immutable data type, which means that once a string is created, it cannot be changed.

Strings in Python can be created by enclosing characters in quotes. Python treats single quotes the same as double quotes.

In the above code, '123.45' is a string. We can confirm this by using the type() function, which returns <class 'str'> , indicating that the data type is a string.

Python Floats

A float, or floating-point number, is a number with a decimal point. Floats are used in Python to represent numbers that aren’t integers. The float() function in Python converts a specified value into a floating-point number.

In this example, we converted the string '123.45' to a float using the float() function. We can confirm the conversion by using the type() function, which returns <class 'float'> , indicating that the data type is a float.

The ability to convert strings to floats in Python extends beyond simple scripts or exercises. It plays a significant role in real-world applications, particularly in data processing and machine learning.

In data processing, datasets often contain numerical values represented as strings. Converting these strings to floats is a crucial step in preparing your data for analysis.

Similarly, in machine learning, you might need to convert strings to floats to feed your data into a model, as many machine learning algorithms require numerical input.

In this example, we have a DataFrame with a column of strings representing floating-point numbers. Using the pd.to_numeric() function, we convert these strings to floats to prepare our data for analysis.

Further Resources for Python Strings

While this guide focused on converting strings to floats, Python offers a wide range of data type conversions. You might find it useful to explore related concepts such as converting strings to integers or lists to tuples. Additionally, understanding error handling in Python can help you write more robust code.

If you’re interested in learning more, here are a few resources that you might find helpful:

  • Python Strings: Tips for Efficient Text Handling : Gain insights into efficient text handling with Python strings, learning tips and methods to improve your code’s performance.

Guide on Concatenating Strings in Python : This guide by IOFlood explores various techniques for concatenating strings in Python, including using the + operator, the str.join() method, and f-strings.

Tutorial on Python Docstrings : This IOFlood tutorial focuses on Python docstrings, explaining what they are and how to use them effectively for documenting.

Python Tutorials : W3Schools provides beginner-friendly tutorials for learning Python.

Python Official Documentation : The official documentation is a comprehensive resource that covers all aspects of the Python programming language.

Python Convert String to Float: A Practical Guide : This practical guide on DigitalOcean explains how to convert a string to a float in Python, covering various scenarios and providing examples to illustrate the conversion process.

In this in-depth guide, we’ve explored the conversion of strings to floats in Python, a task that might seem simple at first but can present challenges in different contexts.

We’ve seen how the float() function can be used to convert strings to floats and discussed potential pitfalls, such as the ValueError that arises when trying to convert a string that doesn’t represent a valid floating-point number.

Beyond the float() function, we’ve also discussed alternative approaches, such as using the Pandas and Numpy libraries. While these libraries can be more suitable for complex scenarios or large datasets, they come with their own considerations, such as handling NaN values in Pandas or the lightweight nature of Numpy.

Here’s a comparison of the methods we’ve discussed:

The ability to convert strings to floats in Python is a fundamental skill that plays a significant role in data processing and machine learning. By understanding the basics, handling common issues, and exploring alternative approaches, you can effectively convert strings to floats in Python and apply this knowledge in your coding journey.

Remember to keep exploring, keep practicing, and keep coding!

About Author

Gabriel Ramuglia

Gabriel Ramuglia

Gabriel is the owner and founder of IOFLOOD.com , an unmanaged dedicated server hosting company operating since 2010.Gabriel loves all things servers, bandwidth, and computer programming and enjoys sharing his experience on these topics with readers of the IOFLOOD blog.

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Convert a string to a number (int, float) in Python

In Python, to convert a string ( str ) to a number, use int() for integers and float() for floating point numbers.

Convert strings to int : int()

Convert strings to float : float(), convert binary, octal, and hexadecimal strings to int, convert scientific notation strings to float, for cases with bases as powers of 2, set the limit.

Use str() to convert a number to a string.

  • Built-in Functions - str() — Python 3.12.1 documentation

To format numbers or strings into various styles like zero-padding, binary, octal, hexadecimal, or scientific notation, use the format() function or the format() method on string objects.

  • Format strings and numbers with format() in Python

You can also convert a list of strings to a list of numbers.

  • Convert a list of strings and a list of numbers to each other in Python

int() converts a string to an integer ( int ).

  • Built-in Functions - int() — Python 3.12.1 documentation

Strings with . or , will raise an error in int() .

To convert a comma-separated string, replace commas with an empty string ( '' ) using replace() .

For more about replace() , refer to the following article.

  • Replace strings in Python (replace, translate, re.sub, re.subn)

In versions released after September 7, 2022 (Python 3.11, 3.10.7, 3.9.14, 3.8.14, 3.7.14, and later), integer-string conversion is limited to 4300 digits by default. More details later.

float() converts a string to a floating point number ( float ).

  • Built-in Functions - float() — Python 3.12.1 documentation

Strings with only a fractional part and those representing integers can be converted to floating point numbers using float() .

By specifying a base as the second argument in int() , strings in binary, octal, or hexadecimal notation can be converted to integers.

The base defaults to 10 , treating the string as a decimal.

Setting the base to 0 allows the string's prefix ( 0b , 0o , 0x , 0B , 0O , 0X ) to determine the conversion.

Both uppercase and lowercase are acceptable for prefixes and hexadecimal letters.

For binary, octal, and hexadecimal conversion details, see the following article.

  • Convert binary, octal, decimal, and hexadecimal in Python

Strings in scientific notation can be converted to floating point numbers using float() .

Both lowercase e and uppercase E are acceptable.

Integer string conversion length limitation

In versions released after September 7, 2022 (Python 3.11, 3.10.7, 3.9.14, 3.8.14, 3.7.14, and later), integer-string conversion is limited to 4300 digits by default.

  • Integer string conversion length limitation — Python 3.12.1 documentation

This limitation aims to prevent DoS attacks that exploit the O(n^2) complexity of integer-string conversions.

  • CVE-2020-10735: Prevent DoS by large int<->str conversions · Issue #95778 · python/cpython

Exceeding 4300 digits in int() and str() results in ValueError .

Note that this also affects internal string conversions in functions like print() and repr() .

As introduced in the next section, conversions with bases that are powers of 2 (binary, octal, hexadecimal, etc.) are unlimited. For affected APIs, refer to the official documentation.

  • Integer string conversion length limitation - Affected APIs — Python 3.12.1 documentation

Conversions where the base is a power of 2, such as binary, octal, or hexadecimal, are not limited.

For example, conversions using int(string, base) with bases such as 2 , 4 , 8 , 16 , 32 , as well as conversions from integers to strings using bin() , oct() , or hex(), do not result in errors, even for values exceeding 4300 digits.

The digit limit can be set using sys.set_int_max_str_digits() . Setting it to 0 removes the limit.

Additionally, the limit can be configured using the environment variable, PYTHONINTMAXSTRDIGITS , or the command-line option, -X int_max_str_digits . For more details, see the official documentation.

  • Integer string conversion length limitation - Configuring the limit — Python 3.12.1 documentation

As stated, this limit is for security reasons, and should be modified with caution, especially in applications handling external input.

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  • How to use f-strings in Python
  • Sort a list, string, tuple in Python (sort, sorted)

How to convert string to float in Python

Table of Contents

Transforming one kind of data type to another kind in Python involves the use of various functions. This article aims to provide details on how to convert a string to a float. The float() function in Python can be used to convert a string to a float. It’s a built-in feature for converting a floating-point number to an entity. Internally, the float() function calls the flo at( ) function of the defined item.

A string is a one- or more-character sequence (letters, numbers, symbols). Strings are a common type of data in computer programs. We need to convert strings to numbers or numbers to strings regularly, especially when dealing with user-generated data.

A function in Python converts a number string to a floating-point number.

Floats, integer, or string are extremely useful. Generally, it has to be in the correct decimal format if it’s a string. As a result, it gives you a floating object.

ValueError is raised on the off chance that the given string has something other than a floating-point representation of a number. But, if no argument is given, 0.0 is returned. On the other hand, Overflow Error is raised if the given statement is beyond the float range.

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How to convert a string to float in Python

Let’s look at a basic Python example of converting a string to a float.

How to convert a string to float in Python

What is the purpose of converting a string to a float?

If we get a float value from user input through the terminal or reading it from a file, they are string objects. As a result, we must precisely convert them to float to perform required operations such as addition, multiplication, and so on.

get a float value from user input through the terminal

The float () function

You can convert virtually any data type to a floating-point number using this function. The syntax is as follows:

Only one parameter is accepted by the method. However, it is optional. If no argument is given, the resultant value from this method is 0.0.

Example 1: convert string to float

Example 1: convert string to float

Example 2: convert string to float

Example 2: convert string to float

Float number conversion from a decimal string

The float class can be used to convert a decimal string to a float number. As an example, consider the following:

The following is the code for transforming a string using float:

Float number conversion from a decimal string

Note that attempting to use the int here would result in an error.

converting a decimal list to a float in for list objects

Similarly, instead of int, you can use float to convert a list of decimal number strings. Here’s an example:

Example 1: converting a decimal list to a float in for list objects

Example 1: converting a decimal list to a float in for list objects

Example 2: converting a decimal list to a float in for list objects

Example 2: converting a decimal list to a float in for list objects

Example 3: converting a decimal list to a float in for list objects

Example 3: converting a decimal list to a float in for list objects

Convert a comma-separated number string to a floating object

Let’s say we have a string called “10,974.76,” which includes the number and commas. Converting this type of string to float is somewhat tricky. We will get an error whenever we make attempts to transfer it to the function float() directly. As an example,

error when converting a string which includes the number and commas to a float

float() returned an error since the string contained characters other than digits. So, before passing the string to the float() function, we need to delete all the extra commas. As an example,

conversion of a string value with a comma to float value

conversion of a string value with a comma to float value

Method to ascertain if a string is a floating

When the above method is run for each of the following string values, the results are represented below.

fastnumbers

fastnumbers is a module with three goals in decreasing order of importance as to why the module was created:

Provide a set of utility functions that wrap the above int and float replacements and provide error handling that is simple, concise, efficient, quick, and versatile.

Provide a collection of functions for quickly determining if an input can be converted to an int or a float.

Provide drop-in replacements for Python’s built-in int and float up to 2 times faster on average. Except for a few unique corner-cases specified in the API documentation for those functions, these functions should behave exactly like the Python built-ins.

fastnumbers

In a Pandas DataFrame, how do you convert strings to floats?

To convert strings to floats in a Pandas DataFrame, you can use one of the two methods below, depending on the situation:

(1) astype(float)

(2) to_numeric

Here, you’ll learn how to convert strings to floats in three different ways:

  • For a column containing both numeric and non-numeric values
  • For a complete DataFrame

Converting Strings to Floats in Pandas DataFrame Scenarios

Scenario 1: strings are used to store numerical values.

Let’s make a DataFrame with just two columns to keep things simple.

The code for creating the DataFrame in Python is shown below. Herein, the ‘Cost’ column values are stored as strings (with single quotes around them). Notice that the same principles would apply if double quotes were used instead of single quotes):

Scenario 1: Strings are used to store numerical values

The aim is to make floats out of the values in the ‘Cost’ column.

The conversion into floats can then be done using the astype(float) method:

The ‘Cost’ column is the ‘DataFrame Column’ in the sense of our example. As a result, the complete code to convert the values to floats is:

Scenario 1: Cost converted to float

Scenario 2: Numeric and non-numeric values

Build a new DataFrame with two columns (‘Item’ and ‘Cost’). This time, however, the values in the ‘Cost’ column will include both numeric and non-numeric data:

In Python, this is how the DataFrame will look:

Scenario 2: Numeric and non-numeric values before conversion

The data form for the ‘Cost’ column is the same as before: Object. After that, you can use the to_numeric method to convert the values in the ‘Cost’ column to floats as follows:

You can convert non-numeric values to NaN by setting errors=’coerce’.

For your convenience, below is the complete code:

Scenario 2: Numeric and non-numeric values before conversion

To go even further, you can use df.replace to replace the ‘NaN’ values with ‘0’ values.

Scenario 2: Numeric and non-numeric values  and replace after conversion

Scenario 3: Convert Strings to Floats, Under the Entire DataFrame

Let’s make a DataFrame with three columns in which all of the values are stored as strings (in single quotes) for the final scenario:

Scenario 3:  Convert Strings to Floats, Under the Entire DataFrame

From what you have observed, the entirety of the columns in the DataFrame have the same data type: object.

You can then use the following syntax to convert all of the values in the DataFrame to floats:

As a result, the complete Python code for performing the conversion will be as follows:

convert all of the values in the DataFrame to floats using df.dastype()

Final Thoughts

This article has shown how to use built-in methods to convert a string native data type to a float data type. In Python, being able to transform data types gives you more flexibility when writing programs. We learned how to change a string value to a float in this tutorial. If we’re not sure what the receiving values are, it’s a good coding practice to convert them first.

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Data Science Parichay

Convert String to Float in Python

In this tutorial, we will look at how to convert a string in Python to a float value, that is, float datatype with the help of some examples.

How to convert string to float in Python?

You can use the Python built-in float() function to convert a string to a float value in Python. The following is the syntax –

It returns the passed string as a floating-point value. Note that if the passed string does not represent a numeric value, it will raise an error.

Let’s look at some examples of using the above syntax to convert a string to a floating-point value.

First, let’s apply the float() function on a string containing a real number with a decimal part, for example, “150.75”.

You can see that we get 150.75 as a float value.

What happens if you pass an integer number as a string to the float() function? Let’s find out.

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We get 150.0 as a float point number after conversion.

If you want to convert the above string to an integer in Python , use the int() function instead.

We get the string as an integer.

What happens if you pass a non-numeric string to the float() function? Let’s find out.

As expected, we get an error because the passed string cannot be represented as a floating-point number.

You might also be interested in –

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Piyush Raj

Piyush is a data professional passionate about using data to understand things better and make informed decisions. He has experience working as a Data Scientist in the consulting domain and holds an engineering degree from IIT Roorkee. His hobbies include watching cricket, reading, and working on side projects.

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Python Convert String to Float

  • Post author: AlixaProDev
  • Post category: Python / Python Tutorial
  • Post last modified: January 11, 2024
  • Reading time: 18 mins read

How to convert a String to Float in Python? Converting a string to a float is a common operation, especially when working with numerical data stored in text files or received as input. In this article, we will look at various techniques for converting a string to a float in Python. The simple method is using the float() function, which is not always the solution. So let’s discuss it in detail.

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1. Quick Examples of Converting String to Float

If you are in a hurry, below quick examples will help you in understanding the different ways to convert a string to a float in Python. We will discuss them in detail with other important tips.

2. The Difference between String and Float in Python

In Python String and float are two different types of datatypes. Here are three points that can show the differences between strings and floats in Python:

  • Type : A string is a sequence of characters, represented as a str object in Python. A float is a numerical value with a decimal point, represented as a float object in Python.
  • Representation : A string is represented by enclosing a sequence of characters in single or double quotes, like this: 'Hello, World!' or "3.14159" . A float is represented by a numerical value with a decimal point, like this: 3.14159 .
  • Usage : Strings are typically used to represent text data, such as names, addresses, or messages. Floats are typically used to represent numerical data, such as measurements or calculations.

3. Convert String to Float using float() Function

The float() function is a built-in function in Python that converts a string or a number to a float type. It is a simple and widely used method for converting a string or a number to a float.

The float() function is flexible and can handle a variety of string formats. As long as they contain a valid float representation. For example, you can use the float() function to convert strings with leading or trailing spaces. It can also convert strings that contain a leading or trailing plus or minus sign.

Yields below output.

Python convert string float

The float() function can handle strings with a positive sign ( + ). So, the float() function successfully converts the string “+10.5” to the floating-point number 10.5.

Similarly, the float() function can also handle strings with a negative sign ( - ). So, the float() function successfully converts the string “-0.1” to the floating-point number -0.1.

4. Convert String Representing Binary to Float

The float() function is of course more powerful but it can only convert strings to floats in base 10. So if you want to binary float representing in string format. You need to use another approach.

These are the steps that you can follow to Convert string representing binary decimal values to float.

  • Split the string into the integer part and the fractional part using the split() method.
  • Use the int() function to convert the integer part of the binary string to an integer in base 2.
  • Iterate over the fractional part of the string and convert each binary digit to a float.

5. Convert String Non Base 10 Values to Float

Just like in the above example, we can convert any string representing any base to float. We can follow the same formula we applied to the binary values in the above example.

Check the following example we have converted a string that represented a base 16 value to float.

6. Convert String to Float using Decimal Module

The decimal module in Python can be useful if you need to perform precise calculations with decimal values. It supports arbitrary-precision decimal arithmetic. It can avoid the round-off errors that can occur when using the built-in float type.

7. Using Regular Expression to Convert String to Float

A regular expression is used to find and extract specific patterns of characters from a string. We can use a regular expression to match and extract the float value from a string in Python. We can use the re module and the search() function to find a float value in the string. Once we find the float value we can use the float() function to do the conversion.

8. Use float.fromhex() to Convert Hexadecimal Format to a Float

In previous examples, we have seen how the conversion from string to float that are not in base 10. Yet we have another function that can help us do the conversion on base 16.

To use the float.fromhex() method, you simply pass the string in hexadecimal format as an argument. This method is useful for converting hexadecimal floating-point literals.

9. Handle Exceptions when Converting String to Float

The built-in float() function can raise a ValueError exception if it is passed a string that cannot be converted to a float. We can enclose the conversion code in a try block and use an except block to catch the ValueError exception.

10. Tips to Convert String to Float in Python

There are several ways to do this conversion, and it is important to choose the method that best meets your needs. We have discussed a few of them. Here are a few points that you should keep in mind while doing the conversion from string to float.

  • The built-in float() function is the easiest and most straightforward way to convert a string to a float in Python.
  • If you need to perform precise decimal calculations, use the decimal module to convert a string to a float.
  • Use a regular expression to extract a float value from a string.
  • Use the float.fromhex() method to convert a hexadecimal string to a float.
  • Use the try and except statements to handle exceptions

Frequently Asked Questions on Python Convert String to Float

You can convert a string to a float in Python using the float() function. Simply pass the string as an argument to the float() function, and it will return the corresponding floating-point number.

If the string contains non-numeric characters (e.g., letters or symbols), attempting to convert it to a float will raise a ValueError . To handle this, you can use a try-except block to catch the error and handle it appropriately.

The float() function can handle strings with scientific notation (e.g., “1.23e4” for 12300). It will correctly convert the string to the corresponding floating-point number.

There are limitations due to the finite precision of floating-point representation in computers. Extremely large or small numbers may lose precision. For high-precision arithmetic, consider using libraries like decimal in Python.

The float() function does not handle strings with commas representing thousands separators. You should remove the commas from the string before conversion.

Summary and Conclusion

You should now have everything you need to effectively convert string to float in your Python programs. If you have any questions, please don’t hesitate to leave a comment. I would be happy to help!

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C++ String to int and vice versa

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C++ String to float/double and vice-versa

  • C++ string to float and double Conversion

The easiest way to convert a string to a floating-point number is by using these C++11 functions:

  • std::stof() - convert string to float
  • std::stod() - convert string to double
  • std::stold() - convert string to long double .

These functions are defined in the string header file.

Example 1: C++ string to float and double

Example 2: c++ char array to double.

We can convert a char array to double by using the std::atof() function.

C++ float and double to string Conversion

We can convert float and double to string using the C++11 std::to_string() function. For the older C++ compilers, we can use std::stringstream objects.

Example 3: float and double to string Using to_string()

Example 4: float and double to string using stringstream.

Recommended Reading: C++ string to int .

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  • String to float and double
  • Char Array to double
  • float and double to string
  • float and double to string Using to_string()
  • float and double to string Using stringstream

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Java Program to Convert String to Float Value

Given a string “str” in Java, the task is to convert this string to float type.

This can be done by two methods as listed below:

  • Using parseFloat() Method 
  • Using valueOf() Method 

Let us discuss above two ways of implementing the methods to get a fair understanding of the conversion of string to float values.

Method 1: Using parseFloat()

The parseFloat() metho d in Float Class is a built-in method in Java that returns a new float initialized to the value represented by the specified String, as done by the valueOf method of class Float.

Parameters : It accepts a single mandatory parameter s which specifies the string to be parsed.

Return type: It returns e float value represented by the string argument.

Exceptions:

  • NullPointerException: When the string parsed is null
  • NumberFormatException: When the string parsed does not contain a parsable float

Example 2: To show unsuccessful conversion 

string change float

Method 2: Using valueof() method 

The valueOf() method of the Float class converts data from its internal form into human-readable form. The valueOf() method converts data from its internal form into a human-readable form. It is a static method that is overloaded within a string for all of Java’s buil t -in types so that each type can be converted properly into a string.  

It is called when a string representation of some other type data is needed-for example during concatenation operation.you can call this method with any data type and get a reasonable String representation valueOf() returns java.lang.Integer, which is the object representative of the integer Few forms of valueOf()

Returns:  

  • It returns string representation of given value
  • valueOf(iNum); // Returns the string representation of int iNum.
  • String.valueOf(sta); // Returns the string representation of the boolean argument.
  • String.valueOf(fNum); // Returns the string representation of the float fnum.
  • String.valueOf(data, 0, 15); // Returns the string representation of a specific subarray of the chararray argument.
  • String.valueOf(data, 0, 5); // Returns the string of charArray 0 to 5
  • String.valueOf(data, 7, 9); // Returns the string of charArray starting index 7 and total count from 7 is 9.

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parseFloat()

The parseFloat() function parses a string argument and returns a floating point number.

The value to parse, coerced to a string . Leading whitespace in this argument is ignored.

Return value

A floating point number parsed from the given string , or NaN when the first non-whitespace character cannot be converted to a number.

Note: JavaScript does not have the distinction of "floating point numbers" and "integers" on the language level. parseInt() and parseFloat() only differ in their parsing behavior, but not necessarily their return values. For example, parseInt("42") and parseFloat("42") would return the same value: a Number 42.

Description

The parseFloat function converts its first argument to a string, parses that string as a decimal number literal, then returns a number or NaN . The number syntax it accepts can be summarized as:

  • The characters accepted by parseFloat() are plus sign ( + ), minus sign ( - U+002D HYPHEN-MINUS), decimal digits ( 0 – 9 ), decimal point ( . ), exponent indicator ( e or E ), and the "Infinity" literal.
  • The + / - signs can only appear strictly at the beginning of the string, or immediately following the e / E character. The decimal point can only appear once, and only before the e / E character. The e / E character can only appear once, and only if there is at least one digit before it.
  • Leading spaces in the argument are trimmed and ignored.
  • parseFloat() can also parse and return Infinity or -Infinity if the string starts with "Infinity" or "-Infinity" preceded by none or more white spaces.
  • parseFloat() picks the longest substring starting from the beginning that generates a valid number literal. If it encounters an invalid character, it returns the number represented up to that point, ignoring the invalid character and all characters following it.
  • If the argument's first character can't start a legal number literal per the syntax above, parseFloat returns NaN .

Syntax-wise, parseFloat() parses a subset of the syntax that the Number() function accepts. Namely, parseFloat() does not support non-decimal literals with 0x , 0b , or 0o prefixes but supports everything else. However, parseFloat() is more lenient than Number() because it ignores trailing invalid characters, which would cause Number() to return NaN .

Similar to number literals and Number() , the number returned from parseFloat() may not be exactly equal to the number represented by the string, due to floating point range and inaccuracy. For numbers outside the -1.7976931348623158e+308 – 1.7976931348623158e+308 range (see Number.MAX_VALUE ), -Infinity or Infinity is returned.

Using parseFloat()

The following examples all return 3.14 :

parseFloat() returning NaN

The following example returns NaN :

Anecdotally, because the string NaN itself is invalid syntax as accepted by parseFloat() , passing "NaN" returns NaN as well.

Returning Infinity

Infinity values are returned when the number is outside the double-precision 64-bit IEEE 754-2019 format range:

Infinity is also returned when the string starts with "Infinity" or "-Infinity" :

Interaction with BigInt values

parseFloat() does not handle BigInt values. It stops at the n character, and treats the preceding string as a normal integer, with possible loss of precision. If a BigInt value is passed to parseFloat() , it will be converted to a string, and the string will be parsed as a floating-point number, which may result in loss of precision as well.

You should pass the string to the BigInt() function instead, without the trailing n character.

Specifications

Browser compatibility.

BCD tables only load in the browser with JavaScript enabled. Enable JavaScript to view data.

  • Number.parseFloat()
  • Number.parseInt()
  • Number.prototype.toFixed()

Python float to string Conversion Using 10 Different Methods

Python float to string

Hello geeks and welcome in this article, we will cover Python float to string conversion. We will look at different methods through which we can perform this conversion. To do so, we will look at various examples involving different methods. But before moving that ahead, let us try to get a brief overview of the 2 data types.

First, let us look at the float ; this kind of data type returns floating-point numbers like- 3.45,8.9, etc. This data type also returns the value for a string of numbers such as “8”, “6”, etc. Now coming to the other data type, which is a string . String data type we can understand it as an array of byte-like Unicode characters . The next section will start looking at different methods to perform the conversion.

Ways to Convert float to string in Python

  • Basic float to string conversion
  • Python float to string using list comprehension
  • Using list comprehension + join() + str()
  • Converting float to string using join() + map() + str()
  • Using NumPy
  • By using the format()
  • Using String formatting
  • Python float to string by repr()
  • Using list() + map()

Let’s see each of them in-depth with the help of examples.

1. Basic float to string conversion

Above, we have performed a very basic float to string conversion . Here we can notice that 1st we have defined a variable ‘a’ . To check its data type , we have used a print statement with a type tag. The output confirms our data type is float . We have used the str tag to change the data type to a string . Once again, we have used the type tag to find the data type. Here the output confirms that we have successfully performed the conversion.

2. list comprehension

This method is preferably used to convert the NumPy float array to an array of string elements. In general, list comprehension can be understood as less code more effective. Let us look at how it is done. Then we will look at the detailed explanation of the process. But at first, let us look at the syntax for it.

Above, we can see that we can perform a successful conversion. Here to do so, we have imported the NumPy library. After which, we have declared an array of float type . Then for the conversion purpose, we have used our syntax. Finally, we have used the print statement, which verifies the conversion.

3. list comprehension + join() + str()

In this particular method, the floating numbers are first converted to a list . After which, they are converted to a string . This method requires a combination of different methods, as mentioned in the heading.

Here we have performed another successful conversion. We can also notice that the conversion follows the list as stated above “Float -> List -> String.” Here the str method is used to convert to the string data type. The join method takes all the methods in iterable and joins them to make a string.

4. join() + map() + str()

To perform this process this operation, the following methods are used. In this process, first, the float is converted to a string. After which, it is converted into a master string.

We will have used the same problem as in the list comprehension + str() + join(). We can also see the sequence “Float-> str->Master str.”

5. Using NumPy

Here we can see that we have performed the conversion using the NumPy module. To do so, we have used the format_float_positional function. What it does is that converts a floating-point scalar as a decimal string.

6. Using format()

Here, we have successfully performed the conversion using the format() method. The format is a string formatting method of Python. This method helps us by linking elements within a string through positional formatting.

7.Using String formatting

We can also perform the conversion using the string formatting method. Python uses a string formatting format similar to the C language, and It is more of an old method.

See again; we have performed a successful conversion. Here we have used the “%f ” format specifier to instruct where to substitute the value of x.

8. Using repr()

Here we have used the repr() method. The general syntax for this method is repr(obj) . On completion of the program, this method returns a printable representational string.

9. Using list() + map()

A few methods involved list and map methods separately, as we have already discussed. This method collectively requires the application of 2.

10.Using f-strings

The basic idea behind this method is to make string interpolation simpler. This is a modern method and easy to use. let us see how it is executed

  • How to Convert int to float in Python Implicitly and Explicitly
  • Python map Function Explanation and Examples
  • Python Round off Techniques | Python round() Function
  • How to solve Type error: a byte-like object is required not ‘str’

In this article, we covered Python float to string conversion . We looked at 9 four different methods to use to do so. As per your need and choice, you can use any 9 methods.

I  hope this article was able to clear all doubts. But in case you have any unsolved queries feel free to write them below in the comment section. Done Reading this, why not read about Type error next.

guest

You forgot the most modern and most convenient way: f-strings f”{a:.2f}” . Once you are used to calling variables directly in the string, you never want to go back to C-style percentage signs.

Rohit Kumar

Thanks for pointing out my mistake. I have added the f-strings method in the article.

wpdiscuz

  • How to Convert Float to String in Python
  • Python How-To's

Python Convert Float to String Using str() Function

Python convert float to string using repr() function.

How to Convert Float to String in Python

This tutorial will explain multiple ways to convert a float to a string in Python. We can convert a float to a string using the str() and repr() functions.

The str() method takes an object as input and converts it into a string type. The example code below demonstrates how to use the str() function to convert a float to string in Python.

The repr() method converts an object into a printable string. The example code below demonstrates how the repr() function converts a float to a string in Python.

Related Article - Python Float

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5 Best Ways to Convert Python Float to String with Precision

Whether for displaying user-friendly output or logging purposes, developers often need to convert floats to strings in Python while maintaining control over the level of precision. This article explores how to transform a float, like 3.14159265 , into a string while specifying the number of decimal places, perhaps aiming for an output such as "3.1416" .

Method 1: Using str.format()

Formatting strings using the str.format() method allows for precise control over floating-point representation. Developers can specify the number of decimal places desired using a format specifier within curly braces—for example, '{:.2f}' for two decimal places.

Here’s an example:

This code snippet converts a float, pi , into a string with four decimal places of precision using str.format() . It outputs the string “3.1416”.

Method 2: Using String Interpolation (f-Strings)

String interpolation with f-strings, available from Python 3.6, is a readable way to embed expressions inside string literals. The same format specifiers as with str.format() may be used directly within the curly braces of f-strings.

This code snippet demonstrates how to achieve string precision using f-strings. It embeds the float pi directly within the string and restricts it to two decimal places.

Method 3: Using the round() Function

The round() function offers a direct way to round a floating-point number to a specified number of decimal places. After rounding, the str() function can be used to convert the number to a string.

This snippet rounds the float pi to three decimal places and then converts the rounded number to a string, resulting in “3.142”.

Method 4: Using decimal.Decimal

For scenarios requiring high precision and control over rounding, the Decimal class from Python’s decimal module is ideal. Once a Decimal object is created and rounded off, it can be converted to a string representation with no loss of precision.

This complex example uses decimal.Decimal to maintain the integrity of a floating-point number and then rounds it off to two decimal places before converting to a string.

Bonus One-Liner Method 5: Using printf -Style Formatting

Older printf -style formatting is still a one-liner option in Python, using the percent symbol to create formatted strings. The format specifier follows the percent symbol to control the decimal precision.

This example employs printf -style formatting to convert the float pi to a string with three decimal places. This method is less preferred due to readability concerns but remains supported in Python.

Summary/Discussion

  • Method 1: str.format() . Provides a versatile way to specify precision. Strengths: Readability, flexibility. Weaknesses: Might be considered verbose for simple tasks.
  • Method 2: f-Strings. Modern and readable, with inline expression formatting. Strengths: Clarity, conciseness. Weaknesses: Only available in Python 3.6+.
  • Method 3: round() then str() . Simple and to the point. Strengths: Built-in, no need for import. Weaknesses: Rounding before conversion may lead to unexpected results due to floating-point arithmetic quirks.
  • Method 4: decimal.Decimal . Suited for financial and other precision-critical applications. Strengths: Precision, clear rounding behavior. Weaknesses: More verbose and requires an import.
  • Method 5: printf -Style. Compact syntax. Strengths: Concise. Weaknesses: Less readable, considered old-fashioned.

Emily Rosemary Collins is a tech enthusiast with a strong background in computer science, always staying up-to-date with the latest trends and innovations. Apart from her love for technology, Emily enjoys exploring the great outdoors, participating in local community events, and dedicating her free time to painting and photography. Her interests and passion for personal growth make her an engaging conversationalist and a reliable source of knowledge in the ever-evolving world of technology.

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  2. Python float to string Conversion Using 10 Different Methods

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  4. How to convert a string to a float

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COMMENTS

  1. How do I parse a string to a float or int?

    How can I convert an str to a float? "545.2222" -> 545.2222 Or an str to a int? "31" -> 31 For the reverse, see Convert integer to string in Python and Converting a float to a string without rounding it.

  2. 6 Ways to Convert String to Float in Python

    Below are 6 common and simple methods used to convert a string to float in python 1) Using float () function You can use the float () function to convert any data type into a floating-point number. This method only accepts one parameter. If you do not pass any argument, then the method returns 0.0.

  3. How To Convert a String to a Float in Python

    We can convert a string to float in Python using the float () function. This is a built-in function used to convert an object to a floating point number. Internally, the float () function calls specified object __float__ () function. Example Let's look at an example of converting a string to float in Python:

  4. Convert String to Float in Python

    print(string) print(type(string)) Float = float(string) print(Float) print(type(Float)) Output: 3.141 <type 'str'> 3.141 <type 'float'> Time complexity: O (1), as there is a fixed number of operations being performed regardless of the size of the input.

  5. Convert String to Float and Back in Java

    2.1. String Concatenation The most straightforward solution we can use is concatenating the floating-point value with an empty String. Let's look at an example: float givenFloat = 1.25f ; String result = givenFloat + "" ; assertEquals ( "1.25", result); Copy Similarly, we can add a Float object to the empty String and get the same result.

  6. Convert a String to a Float in Python: 3 Easy Methods

    You can convert a string to a float in Python using the float () function and the syntax, number = float (data). Here's a quick example to illustrate this: data = '123.45' number = float (data) print (number) # Output: # 123.45 In this example, we have a string '123.45' that we want to convert into a float.

  7. Convert a string to a number (int, float) in Python

    Use str() to convert a number to a string.. Built-in Functions - str() — Python 3.12.1 documentation; To format numbers or strings into various styles like zero-padding, binary, octal, hexadecimal, or scientific notation, use the format() function or the format() method on string objects.. Format strings and numbers with format() in Python

  8. How to convert string to float in python

    The float() function in Python can be used to convert a string to a float. It's a built-in feature for converting a floating-point number to an entity. Internally, the float() function calls the flo at() function of the defined item. A string is a one- or more-character sequence (letters, numbers, symbols). Strings are a common type of data ...

  9. How to convert string to float in Python

    The float () function takes a single argument, which is the string that you want to convert, and returns the float representation of the provided string. Here's an example of how to use the float () function to convert a string to a float: string_number = "123.45" float_number = float (string_number) print (float_number) Output: 123.45

  10. Convert String to Float in Python

    Let's look at some examples of using the above syntax to convert a string to a floating-point value. First, let's apply the float() function on a string containing a real number with a decimal part, for example, "150.75". # string storing a float number s = "150.75" # convert string to float num = float(s) # display the number and its ...

  11. Python Convert String to Float

    The built-in float() function is the easiest and most straightforward way to convert a string to a float in Python. If you need to perform precise decimal calculations, use the decimal module to convert a string to a float. Use a regular expression to extract a float value from a string.

  12. C++ String to float/double and vice-versa

    The easiest way to convert a string to a floating-point number is by using these C++11 functions: std::stof () - convert string to float std::stod () - convert string to double std::stold () - convert string to long double. These functions are defined in the string header file. Example 1: C++ string to float and double

  13. Java Program to Convert String to Float Value

    Method 1: Using parseFloat () The parseFloat () metho d in Float Class is a built-in method in Java that returns a new float initialized to the value represented by the specified String, as done by the valueOf method of class Float. Syntax: public static float parseFloat (String s) ;

  14. parseFloat()

    The parseFloat function converts its first argument to a string, parses that string as a decimal number literal, then returns a number or NaN.The number syntax it accepts can be summarized as: The characters accepted by parseFloat() are plus sign (+), minus sign (-U+002D HYPHEN-MINUS), decimal digits (0 - 9), decimal point (.), exponent indicator (e or E), and the "Infinity" literal.

  15. Python float to string Conversion Using 10 Different Methods

    1. Basic float to string conversion 2. list comprehension 3. list comprehension + join () + str () 4. join () + map () + str () 5. Using NumPy 6. Using format () 7.Using String formatting 8. Using repr () 9.

  16. 5 Best Ways to Convert a Python List of Strings to Float

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  17. How to convert string into float in JavaScript?

    9 Answers Sorted by: 437 If they're meant to be separate values, try this: var values = "554,20".split (",") var v1 = parseFloat (values [0]) var v2 = parseFloat (values [1]) If they're meant to be a single value (like in French, where one-half is written 0,5) var value = parseFloat ("554,20".replace (",", ".")); Share Improve this answer Follow

  18. How to Convert Float to String in Python

    Python Convert Float to String Using str() Function. The str() method takes an object as input and converts it into a string type. The example code below demonstrates how to use the str() function to convert a float to string in Python.

  19. 5 Best Ways to Convert Python Float to String with Precision

    This example employs printf-style formatting to convert the float pi to a string with three decimal places. This method is less preferred due to readability concerns but remains supported in Python. Summary/Discussion. Method 1: str.format(). Provides a versatile way to specify precision. Strengths: Readability, flexibility.

  20. string

    11 Answers Sorted by: 701 numbers = [23.23, 0.1233, 1.0, 4.223, 9887.2] for x in numbers: print (" {:10.4f}".format (x)) prints 23.2300 0.1233 1.0000 4.2230 9887.2000 The format specifier inside the curly braces follows the Python format string syntax. Specifically, in this case, it consists of the following parts:

  21. Convert float to std::string in C++

    How do I convert from float to string? float val = 2.5; std::string my_val = val; // error here c++ type-conversion Share Follow edited Nov 16, 2016 at 16:11 davidism 124k 30 405 342 asked Jan 24, 2010 at 3:59 adam_0 7,020 6 41 52 5 Consider reading Herb Sutter's article "The String Formatters of Manor Farm" ( gotw.ca/publications/mill19.htm ).