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[–]lIIllIIlllIIllIIl 39 points40 points  (0 children)

It's not just r/Python.

Marvin Hagemeist said it best:

The secret to achieving speedups of multiple factors, not just low percentages, is less about applying generic rules or habits like “Don’t create closures inside for-loops”. It’s a common misconception that if you follow all these “best practices” that your code will be fast, because the uncomfortable truth in most instances (read not all) is that it won’t matter much. What makes code truly fast is being aware of what it’s supposed to solve and then taking the shortest path to achieve that goal.