Hi Raymond,
Another example: extensions in Mercurial. Mercurial is a VCS with a
typical command line syntax:
$ hg <command> <command arguments and options>
Mercurial has an extension mechanism for adding new and modifying
existing commands. A big chunk of Mercurial functionality is
implemented in `ui` and `repo` classes and extensions often patch those
to override the default behavior. For instance, you could check the
`color` extension, which patches `ui` to override `write*` methods:
http://selenic.com/hg/file/3790452d499b/hgext/color.py#l152
Thanks,
Kirill
On 11/24/2010 03:08 PM, Raymond Hettinger wrote:
I'm writing-up more guidance on how to use super() and would like to
point at some real-world Python examples of cooperative multiple
inheritance.
Google searches take me to old papers for C++ and Eiffel, but that
don't seem to be relevant to most Python programmers (i.e. a
WalkingMenu example where a submenu is both a Entry in a Menu and a
Menu itself). Another published example is in a graphic library where
some widgets inherit GraphicalFeature methods such as location, size
and NestingGroupingFeatures such as finding parents, siblings, and
children. I don't find either of those examples compelling because
there is no particular reason that they would have to have overlapping
method names.
So far, the only situation I can find where method names necessarily
overlap is for the basics like __init__(), close(), flush(), and
save() where multiple parents need to have their own initialization
and finalization.
If you guys know of good examples, I would appreciate a link or a
recap.
Thanks,
Raymond
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