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 <1401779143.76.0.885273289732.issue1683368@psf.upfronthosting.co.za>
In-reply-to
Content
Jason, I made some recommendations on this subject in my blog post a few years ago:  http://rhettinger.wordpress.com/2011/05/26/super-considered-super/

'''
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
        super().__init__(**kwds)        

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

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

'''
History
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: <1401779143.76.0.885273289732.issue1683368@psf.upfronthosting.co.za>
2014-06-03 07:05:43rhettingerlinkissue1683368 messages
2014-06-03 07:05:43rhettingercreate