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195

Python Performance: Why 'if not list' is 2x Faster Than Using len() (blog.codingconfessions.com)

submitted 1 week ago by [email protected] to c/[email protected]

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[–] [email protected] 1 points 1 week ago* (last edited 1 week ago)

Oh, there are plenty of other terrible ways:

for _ in mylist:
    break
else:
    # whatever you'd do if mylist was empty

if not any(True for _ in mylist):

try:
    def do_raise(): raise ValueError

    _ = [do_raise() for _ in mylist]
except ValueError:
    pass
else:
    # whatever you'd do i mylist was empty

I could probably come up with a few others as well.

Please note that none of these handles the TypeError if mylist is None.