How Can I Efficiently Replace List Elements Using List Comprehension and Conditional Logic?

Searching and Replacing Elements in a List with a List Comprehension and Conditional Expression

Searching through a list to find and replace specific elements is a common programming task. Let's use a simple example to illustrate the most efficient approach:

Suppose we have a list of integers a:

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

And we need to replace all occurrences of the number 1 with the value 10. Using a list comprehension and a conditional expression, we can achieve this as follows:

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

In this code:

• We iterate through each element x in the original list a.
• If x is equal to 1, we replace it with 4 using the conditional expression 4 if x == 1 else x.
• If x is not equal to 1, we leave it unchanged.

The result is a new list replaced_list with the desired replacements applied:

[4, 2, 3, 4, 5, 4, 2, 3, 4, 5, 4]

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