Eric V. Smith <e...@trueblade.com> added the comment:

This is defined behavior. Try searching for "mutable default parameter". For 
example, here's an old post on it:

http://www.effbot.org/zone/default-values.htm

This isn't related to class vs. instance attributes, but rather the default 
parameter 'props' being modified.

----------
nosy: +eric.smith
resolution:  -> not a bug
stage:  -> resolved
status: open -> closed

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue32168>
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