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Groups > comp.lang.python > #21087

exec

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Hi,

I would like to define methods using exec like this:

class A:
    def __init__(self):
        cmd = "def sqr(self, x):\n    return x**2\nself.sqr = sqr\n"
        exec cmd
a = A()
print a.sqr(a, 2)

This works, but I have to call sqr with a.sqr(a, 2), a.sqr(2) does not work
(TypeError: sqr() takes exactly 2 arguments (1 given)).

Is there a possibility to define methods using exec and getting normal behavior?

I would be very appreciative for any help.

With kind regards
Rolf Wester

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exec Rolf Wester <rolf.wester@ilt.fraunhofer.de> - 2012-03-01 14:07 +0100
  Re: exec Jean-Michel Pichavant <jeanmichel@sequans.com> - 2012-03-01 14:46 +0100
  Re: exec Arnaud Delobelle <arnodel@gmail.com> - 2012-03-01 14:13 +0000
  Re: exec Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-03-01 14:21 +0000
  Re: exec Rolf Wester <rolf.wester@ilt.fraunhofer.de> - 2012-03-01 16:58 +0100
    Re: exec Michael Ströder <michael@stroeder.com> - 2012-03-01 17:26 +0100
    Re: exec Peter Otten <__peter__@web.de> - 2012-03-01 18:14 +0100
      Re: exec Rolf Wester <rolf.wester@ilt.fraunhofer.de> - 2012-03-01 18:23 +0100
    Re: exec Peter Otten <__peter__@web.de> - 2012-03-02 08:26 +0100

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