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Wed Feb 18 23:32:09 CET 2009 · https://mail.python.org/pipermail/python-dev/2009-February/086231.html

Hi!

I am curious why the following will not work in Python:

  class foo(object):
      def bar(self):
          print self.attr

  class duck(object):
      attr = 3.14

  foo.bar(duck())

Is it a design decision that duck-typing self does not work or is there a
technical reason? From a practical standpoint it seems that being able to
duck-type self has merit, for example in unit testing complex classes.

 - Sebastian

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[Python-Dev] Duck-typing self