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Python Performance: Why 'if not list' is 2x Faster Than Using len()
(blog.codingconfessions.com)
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this post was submitted on 12 Apr 2025
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There are decades of articles on c++ optimizations, that say "use empty() instead of size()", which is same as here.
except for c++ it was just to avoid a single function call, not extra indirection. also on modern compilers size() will get inlined and ultimate instructions generated by the compiler will likely be the same