Mutable default values for function parameters

[Erik Max Francis]

Brian Quinlan wrote:

> Those should raise some sort of exception, not silently do the
> default.
> 
> You could change it to:
> d = (d is None) or []

That won't work either.  d is None evalutes to 1, not d, so when d is
None d will get replaced with 1, not with a new empty list.

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