This issue tracker has been migrated to GitHub, and is currently read-only.
For more information, see the GitHub FAQs in the Python's Developer Guide.

Author rhettinger
Recipients KayEss, Rhamphoryncus, benjamin.peterson, blakeross, eric.snow, georg.brandl, gregory.p.smith, gvanrossum, jaraco, jcea, jonash, rhettinger, terry.reedy
Date 2014-06-03.07:05:43
SpamBayes Score -1.0
Marked as misclassified Yes
Message-id <>
Jason, I made some recommendations on this subject in my blog post a few years ago:

A more flexible approach is to have every method in the ancestor tree cooperatively designed to accept keyword arguments and a keyword-arguments dictionary, to remove any arguments that it needs, and to forward the remaining arguments using **kwds, eventually leaving the dictionary empty for the final call in the chain.

Each level strips-off the keyword arguments that it needs so that the final empty dict can be sent to a method that expects no arguments at all (for example, object.__init__ expects zero arguments):

class Shape:
    def __init__(self, shapename, **kwds):
        self.shapename = shapename

class ColoredShape(Shape):
    def __init__(self, color, **kwds):
        self.color = color

cs = ColoredShape(color='red', shapename='circle')

Date User Action Args
2014-06-03 07:05:43rhettingersetrecipients: + rhettinger, gvanrossum, georg.brandl, terry.reedy, gregory.p.smith, jcea, jaraco, Rhamphoryncus, blakeross, benjamin.peterson, KayEss, jonash, eric.snow
2014-06-03 07:05:43rhettingersetmessageid: <>
2014-06-03 07:05:43rhettingerlinkissue1683368 messages
2014-06-03 07:05:43rhettingercreate