# 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.

Updated October 18, 2023

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 `int()`. The `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.

# Conclusion

In this article, we’ve covered how to convert strings to integers in Python using the `int()` and `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.