Forwarding keyword arguments from one function to another

Ravi ra.ravi.rav at gmail.com
Sun Feb 22 20:44:50 CET 2009


The following code didn't work:

class X(object):
        def f(self, **kwds):
                print kwds
                try:
                        print kwds['i'] * 2
                except KeyError:
                        print "unknown keyword argument"
                self.g("string", **kwds)

        def g(self, s, kwds):
                print s
                print kwds

if __name__ == "__main__":
        x = X()
        x.f(k = 2, j = 10)


However the following did:

class X(object):
        def f(self, **kwds):
                print kwds
                try:
                        print kwds['i'] * 2
                except KeyError:
                        print "unknown keyword argument"
                self.g("string", **kwds)

        def g(self, s, **kwds):
                print s
                print kwds

if __name__ == "__main__":
        x = X()
        x.f(k = 2, j = 10)



Please explain



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