How Can I Apply a Function to Each Element in a Python List?

Applying Functions to List Elements

This question seeks to understand how to apply a specific function to each element within a list. Given a list like mylis consisting of strings, a programmer may want to apply a function like str.upper to convert each string to uppercase.

Responding to this challenge, the answer suggests a powerful technique known as a list comprehension. This concise syntax allows you to create a new list wherein each element is the result of applying a specific transformation or function to corresponding elements in the original list.

In the provided example, the list comprehension takes the form: [item.upper() for item in mylis]. Here's how this works:

1. Iteration over the list: The for item in mylis clause iterates through each element in mylis.
2. Function application: The item.upper() expression applies the str.upper function to each element, converting it to uppercase.
3. List creation: The resulting values are collected into a new list, where each element is the uppercase version of the corresponding element in mylis.

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