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* Eliminate mutable default argumentsTimur Sufiev2015-12-172-0/+41
The best practice in Python is not to use mutable object (i.e. list, dictionary, or instances of most classes) as value of default argument (see https://goo.gl/Kwhg0T). A hacking rule to enforce this practice is added as well. The patch was inspired by CR https://review.openstack.org/#/c/198465/ and took most of its code from it as well. That's why original copyrights are kept. Closes-Bug: #1471349 Change-Id: Ia77b1736dbc3d4e28ff2d2c3424e9cfcaefa5077