Some projects use module variables like
__license__, as in:
__author__ = "Software Authors Name" __copyright__ = "Copyright (C) 2004 Author Name" __license__ = "Public Domain" __version__ = "1.0"
Seems like a pretty clean solution to me (unless you overdo it and dump epic texts into these variables), but only
__version__ seems to be in widespread use, as it is mentioned in PEP 8.
As I know, there is currently no standard way. Each company/organization will have their own template to doc the copyright information. If this is your personal project, then just feel free to doc it in the way you feel most comforable. Adding a
LICENSE file is a very common way for projects with many source files. Even in Python, there is currently no standard on the structure of docstrings.
Python provides a lot of freedom, so just let it be dude ;)