Convert Strings to Integers in Python: A Step-by-Step Guide
Learn how to easily convert string values to integer numbers in Python using the built-in
int() function. Discover the best practices and examples to ensure accurate conversion.
In Python, you can convert a string to an integer using the
int() function. This function takes a string as its argument and returns an integer object. Here’s an example:
>>> int("42") 42
As you can see, the
int() function converts the string “42” to the integer 42. But what if the string contains non-numeric characters? In that case, you need to use a different approach.
How to Convert Strings to Integers with Non-Numeric Characters
To convert a string to an integer even if it contains non-numeric characters, you can use the
float() function instead of
float() function is more lenient and will try to convert the string to a floating-point number. Here’s an example:
>>> float("42.5") 42.5
As you can see, the
float() function converts the string “42.5” to the floating-point number 42.5.
How to Convert Strings to Integers with Custom Functions
If you need to convert a large number of strings to integers, it may be more efficient to write a custom function to do so. Here’s an example of a custom function that converts a string to an integer:
def int_from_string(str): return int(float(str))
This function takes a string argument and returns the integer equivalent of that string, using the
float() function to perform the conversion. Here’s an example of how to use this function:
>>> int_from_string("42.5") 42
As you can see, the custom function
int_from_string() converts the string “42.5” to the integer 42.
In this article, we’ve covered how to convert strings to integers in Python using the
float() functions, as well as a custom function. These techniques can be useful when working with data that contains both numeric and non-numeric characters, and can help you perform more accurate calculations and comparisons.
I hope this article has been helpful! Let me know if you have any questions or need further clarification on any of the topics covered here.