Default argument initialization with list found which is a loop hole in python

[neel004]

Describe the bug
When an argument is initialized with an empty list in python, it retains previous values it has accumulated while executing the method.

To Reproduce
Steps to reproduce the behavior:
Link to code: https://github.com/python-gsoc/python-blogs/blob/master/aldryn_people/cms_toolbars.py#L47:

Additional context
Link for reference: https://web.archive.org/web/20200221224620id_/http://effbot.org/zone/default-values.htm

[vrac10]

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