[issue4619] Invalid Behaviour When a Default Argument is a Mutable Object

[David W. Lambert]

David W. Lambert <lambertdw at corning.com> added the comment:

Mutable function arguments and class variables are python's mechanisms
to provide data persistence at these scope levels.  Quite opposite of
design flaw, they are necessary!  Write a decorator to change the
behavior   where you'd like an empty mutable defaults if you're not
happy with other methods already described.

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nosy: +LambertDW

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