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

submitted 2 weeks ago by [email protected] to c/[email protected]

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[–] [email protected] 1 points 2 weeks ago

I haven't read the article. But I'd assume this is for the same reason that not not string is faster than bool(string). Which is to say that it has to do with having to look up a global function rather than a known keyword.

[–] [email protected] 1 points 2 weeks ago (11 children)

Isn't it because list is linked list, so to get the Len it has to iterate over the whole list whereas to get emptyness it just have to check if there is a 1st element ?

I' too lazy to read the article BTW.

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