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Python Performance: Why 'if not list' is 2x Faster Than Using len() (blog.codingconfessions.com)
submitted 5 days ago by jnovinger@programming.dev to c/python@programming.dev
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[-] sugar_in_your_tea@sh.itjust.works 3 points 4 days ago

Same with dictionaries, iterators (will consume the iterator!), and anything else that has a length.

I've actually had the string instead of list issue a number of times, because sometimes things get off and it's hard to track down where things went wrong.

For this reason, I think type hints are the way to go. Use them consistently w/ a static analysis tool like pyright and you'll catch a lot of these issues before running into cryptic error messages.

this post was submitted on 24 Apr 2025
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