Convert string to float python with comma

Convert string to float in python

In this article, we will discuss how to convert a number string to a float object.

Table of Contents

Python provides a function to convert a number string into a floating-point number.

Syntax of float() function

• It can be an int, float, or string.
• If it is a string, then it must be of correct decimal format.

Frequently Asked:

• It returns a float object.
  • If the provided string contains anything other than a floating-point representation of a number, then it will raise ValueError
  • If no argument is provided, then it returns 0.0
  • If the given argument is outside the range of float, it raises overflow Error.

  Let’s see some examples, where we will use the float() function to convert string to a float object.

  Convert string to float object in python in python

  Suppose we have a string ‘181.23’ as a Str object. To convert this to a floating-point number, i.e., float object, we will pass the string to the float() function. Which converts this string to a float and returns the float object. For example,

  value = '181.23' # Convert string to float num = float(value) print(num) print('Type of the object:') print(type(num))

  Convert number string with commas to float object

  Suppose we have a string ‘10,181.23’, it contains the number but also has some extra commas. To convert this kind of string to float is a little tricky. If we directly pass this to the float() function, then it will raise an error. For example,

  value = '10,181.23' num = float(value)

  ValueError: could not convert string to float: '10,181.23'

  As string had characters other than digits, so float() raised an error. So, we need to remove all the extra commas from the string before passing it to the float() function. For example,

  value = '10,181.23' # convert string with comma to float num = float(value.replace(',', '')) print(num) print(type(num))

  We can convert a number in a string object to a float object using the float() function.

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  How to convert strings with commas to float in Python

  In this Python tutorial, we will see how to convert strings with commas to float in Python using different methods with demonstrative examples.

  How to convert string to float Python

  Let’s see how to convert string to float in Python.

  In this example, we will use built-in float() function to convert string to float in Python.

  str = '15.456' f = float(str) print('Float Value =', f)

  You can refer to the below screenshot to see the output for how to convert string to float Python.

  

  The above code we can use to convert string to float in Python.

  Convert list of string to float Python

  Let’s see how to convert list of string to float Python.

  In this example, we will convert a list of strings to float and we will use a for-loop to iterate throughout the list. Also, we will append the converted item to a new list.

  str = ['1.1', '2.2', '3.3', '3.4'] l_floats = [] for item in str: l_floats.append(float(item)) print(l_floats)

  You can refer to the below screenshot to see the output for how to convert list of string to float python.

  

  This is how to convert list of string to float Python.

  Understanding the problem:

  Large numbers are often represented with commas to make them easier to read.

  For example, one million is commonly written as 1,000,000. If we attempt to convert this string to a float in Python with commas, without any manipulation, an error will occur, as the standard float() function in Python does not handle commas.

  million = '1,000,000' print(type(million)) after_converting = float(million) print(type(after_converting))

  The output is:

  Traceback (most recent call last): File "C:\Users\USER\PycharmProjects\pythonProject\TS\main.py", line 4, in after_converting = float(million) ^^^^^^^^^^^^^^ ValueError: could not convert string to float: '1,000,000'

  

  There are different methods to convert strings with commas to float in Python without any error.

  Convert strings with commas to float in Python

  To convert the string with commas to a float in Python, we need to first remove the commas from the string, then only we can convert the strings with commas into float data types in Python using the float() function.

  There are three different methods to remove commas from a string in Python. They are:

  • Naive Method- using for loop with conditional statement
  • replace() string function
  • split() and join() Method

  We will use these methods to remove commas and then, convert those strings to float in Python.

  Remove commas from the Python string to float with commas using the naive method

  In the naive method, we will use for loop in Python to loop over the string and will remove the commas using conditional statements, and then we will convert that string(without commas) into float using the float() function.

  For example, suppose we are developing a financial application where we are given the price of a stock in a Python string format with commas (in USD). We need to convert this into float to perform financial computations.

  stock_price = "2,999.99" stock_price_float = "" for x in stock_price: if x == ',': continue else: stock_price_float += x stock_price_float = float(stock_price_float) print(stock_price_float) print(type(stock_price_float))

  Here, we first created an empty string in Python and then we had to loop over the string with commas and applied the conditional statement to remove the commas, and then converted the resultant string into a float in Python.

  The output is:

  

  This way we can use Naive method to convert string with comma to float in Python.

  Remove commas from the Python string to float with commas using the replace() string function

  The first step is to remove the commas from the string. Python’s replace() string function can be used for this. The Python replace() string function replaces all occurrences of a specified value with another value. After removing the commas, we can now safely convert string with commas to float Python using Python’s float() function.

  For example, We have a bank statement with us where the account balance is shown in the terms of a Python String. To do mathematical calculations we need to convert this data into a float value.

  Account_balance = '1,085,555.22' Account_balance = Account_balance.replace(",", "") Account_balance_float = float(Account_balance) print(Account_balance_float) print(type(Account_balance_float))

  The Output is:

  

  What if we are having a Python list with string values with commas and we have to convert them into a float to do some mathematical operation in Python?

  For example, We are working on a data analysis project where we have a Python list of the population of different cities in the US, in string format with commas. You need to convert these into float to perform arithmetic operations in Python.

  population_list = ["8,398,748", "3,990,456", "2,716,450"] # convert to float population_list = [float(pop.replace(",", "")) for pop in population_list] print(population_list)

  The output is:

  [8398748.0, 3990456.0, 2716450.0]

  

  This way we can use the replace() string function in Python to convert the string to float with commas.

  Remove commas from the Python string to float with commas using the split() and join() method

  We can use a combination of the split() and join() string methods in Python to remove the commas before conversion.

  The split(“,”) method splits the original string into a list of strings in Python, breaking at each comma. Then, “”.join() concatenates these strings in Python back together, effectively removing the commas. This string, now without commas, can then be converted into a Python float using the float() function.

  For instance, we have a amount to pay to a store but the amount is written in a form of a Python string. we have to do some mathematical operations with that amount in Python. so we need to convert that value into the form of a Python float.

  amount = "1,000,000" amount_no_commas = "".join(amount.split(",")) amount_float = float(amount_no_commas) print(amount_float)

  The output is:

  

  This way we can convert Python string with commas to float using the split() and join() methods.

  Conclusion

  Python is a versatile programming language, capable of handling numerous data manipulation tasks with ease, including the conversion of data types. This tutorial specifically explored how to convert strings with commas into float numbers in Python.

  We have seen three primary methods: using the Naive method, using the replace() string function, and combining the split() and join() string methods. Each method has its own applications and can be chosen based on the specific requirements of our program.

  You may also like to read:

  I am Bijay Kumar, a Microsoft MVP in SharePoint. Apart from SharePoint, I started working on Python, Machine learning, and artificial intelligence for the last 5 years. During this time I got expertise in various Python libraries also like Tkinter, Pandas, NumPy, Turtle, Django, Matplotlib, Tensorflow, Scipy, Scikit-Learn, etc… for various clients in the United States, Canada, the United Kingdom, Australia, New Zealand, etc. Check out my profile.

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