Add methods to a class dynamically
Damien Metzler
dmetler.nospam at partner.auchan.fr
Fri Jun 6 10:49:18 EDT 2003
Hoang Do wrote:
> I am having trouble invoking the created method. The function addition goes
> fine but invoking it gives an error. Here is some simple code:
> ---------------------------------------------------------
> class DynObj:
> def __init__(self):
> self.methods = ("a", "b", "c")
> for method in self.methods:
> self. __generateMethod(method)
> def __generateMethod(self, methodName):
> code = "def %s(self):\n\tprint %s\n" % (methodName, methodName)
> exec code in globals(), self.__dict__
>
> if __name__ == "__main__":
> x = DynObj()
> print dir(x)
> x.a(x)
> ---------------------------------------------------------
> The Error:
> NameError: global name 'a' is not defined
> ---------------------------------------------------------
> Methods "a", "b", and "c" are callable and in DynObj's __dict__. However, I
> can't seem to call it.
>
> Calling for help from anyone familiar with Python's introspective features?
code = "def %s(self):\n\tprint '%s'\n" % (methodName, methodName)
you forgot the ' so your looking to print the variable a wich is not
defined as a global variable
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