CODEWITHSUNDEEP
pythonpython-3.x
Robert
Robert

Reputation: 55

Mandatory While Loop Gives Local Variable Might Be Referenced Before Assignment

The issue I am having is that it should be impossible not break out of the while loop, AKA "matched_index" will always be defined, yet my IDE is throwing an "may be referenced before assignment" error. What is the Pythonic way to code this? The closest I found was this post, but I'm not sure how to code what kindall is suggesting.

Here is my code:

        another_list = [0] * len(my_list)
        if X in my_list:
            i = 0
            while i < len(my_list):
                if X == my_list[i]:
                    matched_index = i
                    break
                i += 1
            another_list[matched_index] = 0.2

Upvotes: 0

Views: 416

Answers (1)

Makoto
Makoto

Reputation: 106430

Just initialize matched_index, or move your assignment statement into the loop (so that you're not using another temporary variable to hold it).

While it might be true that, from a logical perspective, the code won't run into a scenario where len(my_list) == 0, the lexer can't guarantee it.

Upvotes: 3

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