13 votes

Python Performance: Why 'if not list' is 2x faster than using len()

Posted by winther
Tags: programming languages, python, performance, source.codingconfessions, author.abhinav upadhyay, paywall
https://blog.codingconfessions.com/p/python-performance-why-if-not-list

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Authors
Abhinav Upadhyay
Word count
899 words

1 comment

  1. teaearlgraycold
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    Seems like something that could be optimized by detecting the pattern of opcodes and checking that the object is a list on first execution, patching in a check and list optimization for future...

    Seems like something that could be optimized by detecting the pattern of opcodes and checking that the object is a list on first execution, patching in a check and list optimization for future executions if so.

    1 vote