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.
this post was submitted on 12 Apr 2025
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Python Performance: Why 'if not list' is 2x Faster Than Using len()
(blog.codingconfessions.com)
So… it has to iterate over the whole empty list is what you’re saying? like once for every of the zero items in the list?
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(4 replies)
Then please be less lazy next time.
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(1 replies)