R. David Murray added the comment:

Well, it's a problem in general because if the called routine modifies the 
default dict...the default is modified.  I'm guessing it is never modified, but 
it is indeed better future proofing of the code to not use a mutable default in 
a routine that passes the variable to other functions, as this one does.

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nosy: +r.david.murray

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue27728>
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