Serhiy Storchaka <[email protected]> added the comment:
On other hand, beginners are confused even by chained "==". There are regular
reports about this on the tracker and questions on Python-related resources.
I have found the chained "in" is useful in the following case
len(string) >= 2 and string[0] == string[-1] in ("'", '"')
for testing if the string is quoted with a single or double quotes.
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<https://bugs.python.org/issue32055>
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