[issue20729] mailbox.Mailbox does odd hasattr() check

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Note that there is a difference between Mailbox and dict interface: __iter__() 
iterates over values, not keys.

clear() should use keys(), not iterkeys(), because it modifies iterated dict.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue20729>
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