New submission from brendon zhang <brendon-zh...@hotmail.com>:

There is a performance regression of the max (and also min) function 
implementation starting in python 3.7.

I provide code and associated benchmarks in the file attachment.

----------
components: Library (Lib)
files: maxbug.py
messages: 365978
nosy: brendon-zh...@hotmail.com
priority: normal
severity: normal
status: open
title: max() performance regression (quadratic time)
type: performance
versions: Python 3.7
Added file: https://bugs.python.org/file49043/maxbug.py

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<https://bugs.python.org/issue40225>
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