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Python Performance: Why 'if not list' is 2x Faster Than Using len() (blog.codingconfessions.com)
submitted 3 months ago by abhi9u@lemmy.world to c/technology@lemmy.world
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[-] sugar_in_your_tea@sh.itjust.works 2 points 3 months ago

That's worse. IMO, solve this problem with two things:

  • type hint mylist as list | None or just list
  • use if not mylist:

The first documents intent and gives you static analysis tools some context to check for type consistency/compatibility, and the second shows that None vs empty isn't an important distinction here.

this post was submitted on 12 Apr 2025
209 points (100.0% liked)

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