Replacing List Elements Using Comprehension and Conditional Expressions

Searching and replacing elements in a list is a common programming task. To achieve this, leverage the power of list comprehension along with a conditional expression.

Consider a list of integers as an example:

a = [1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1]

Our objective is to replace all occurrences of 1 with 10 within the list. Using list comprehension and a conditional expression, we can create a new list with the desired replacements:

[4 if x == 1 else x for x in a]

In this expression, we iterate through each element x in the list a. If x is equal to 1, it is replaced with 4; otherwise, it remains unchanged. The result is a new list with all 1s replaced with 4s:

[4, 2, 3, 4, 3, 2, 4, 4]