Mark Dickinson <dicki...@gmail.com> added the comment:

This is a common gotcha. Take a look at: 
https://docs.python.org/3/faq/programming.html#why-are-default-values-shared-between-objects

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nosy: +mark.dickinson
resolution:  -> not a bug
stage:  -> resolved
status: open -> closed

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue38370>
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