KITFORMA · EDITORIAL ANSWER
Why does removing items while iterating over a list skip some matches?
KitForma editorial guide. Removing an element shifts later elements left while the iterator continues forward. The next matching item can move behind the iterator.
Step-by-step answer
Removing an element shifts later elements left while the iterator continues forward. The next matching item can move behind the iterator.
Create a filtered result, such as
kept = [x for x in items if x >= 0]. If callers must retain the same list object, assign items[:] = kept after selection. Test consecutive unwanted values, an empty list and a list where every item is removed. Iterating over a copy can also work, but repeated remove calls are inefficient and ambiguous when equal values repeat. For large streams, yield accepted values instead of building an unnecessary full copy.Sources and verification
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