Steven D'Aprano <steve+pyt...@pearwood.info> added the comment:

Sorry, this is not a bug, but working as designed. Default values for functions 
and methods are only created once, when the function is created, not on every 
call.

This is a FAQ:

https://docs.python.org/3/faq/programming.html#why-are-default-values-shared-between-objects

----------
nosy: +steven.daprano
resolution:  -> not a bug
stage:  -> resolved
status: open -> closed

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue42227>
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