Steven D'Aprano <steve+pyt...@pearwood.info> added the comment:

This is not a language bug, it is a bug in your code: you are modifying the 
list as you iterate over it.

There are lots of ways to do that task correctly, perhaps the easiest is with a 
filter:

    str_list = list(filter(bool, str_list))

or a list comprehension:

    str_list = [s for s in str_list if s]

or by iterating over a copy of the list:

    for item in str_list[:]:  # use slice syntax to make a copy
        ...

----------
nosy: +steven.daprano
resolution:  -> not a bug
stage:  -> resolved
status: open -> closed

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue43150>
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