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Asked Aug/2/2023 ago
Modified Aug/7/2023 ago
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Can you help improve this post? Post a detailed answer to this question, Make sure to include references or provide extras that justify why your answer is accurate. Brief or insufficient answers may be subjected to edits or removal.

I'm currently working on a project where I'm parsing through a CSV file with multiple columns of numerical data stored as strings. These strings contain float values, not integers. One of these columns contains prices for various products in a string format such as:

"56.32", "78.90", "45.67", ...

And I need to turn floats in string into numeric floats, in order to perform mathematical calculations on the actual floating point values.

How can I convert a string to a float in Python? Specifically, I'd like to know how to turn:

"56.32" → 56.32
"78.90" → 78.90
"45.67" → 45.67

Are there any built-in methods in Python for this conversion? Also, how should I handle cases where the string might not be convertible to a float (e.g., non-numeric characters or empty strings)? I would appreciate any help, code examples are especially welcomed.
pythonstringfloatformatconvertcastSave Post
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Asked 2 Aug 2023 21:05
Ghost Together
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Before converting to float, use this regular expression to determine if the string can be converted to decimal floating point number: bool(re.match(r"^[-+]?\d*\.\d+", s)) of course you will also need to import re module. Ghost Together 3 Aug 2023 00:20 AM
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You can convert a string to a float in Python using the built-in float() function. The proper way to deal with values that are not convertable to float, is to create an exception using try keyword. Ghost Together 2 Aug 2023 22:05 PM
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Can you help improve this post? Post a detailed answer to this question, Make sure to include references or provide extras that justify why your answer is accurate. Brief or insufficient answers may be subjected to edits or removal.

You can convert a string to a float in Python using the built-in float() function.

Here's a simple usage example:

str_value = "56.32"
float_value = float(str_value)

However, for dealing with cases where the conversion is not possible due to non-numeric characters or empty strings, you can use a try-except block to handle the ValueError that would be raised:

def safe_float_convert(str_value):
    try:
        return float(str_value)
    except ValueError:
        print(f'Invalid value for float conversion: {str_value}')
        return None

Now, you can apply this function to your list of strings:

str_values = ["56.32", "78.90", "45.67", "non_numeric", ""]
float_values = [safe_float_convert(val) for val in str_values]

This will create a new list, float_values, with the converted float values. Any invalid strings that couldn't be converted to a float will be None in the new list.
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Asked 2 Aug 2023 23:16
Ghost Together
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This page is currently 32/38 on Google for "python string to float", thanks for all of your contributions! Ghost Together 12 Aug 2023 14:19 PM
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