Python type checking?

[Arinte]

class PossArg:
   def __init__(self,argname, argvalue):
      self.argname = argname
      self.argvalue = argvalue

   def getValue(self):
      return self.argvalue
   def getName(self):
      return self.argname

   def setValue(self, value):
      self.argvalue = value

On the set setValue(), they set it to an integer value I want to make
it a long else if it is a string leave it as a string.  How can this be
done?  I figure I can do a if (type(argvalue)=="int"), but how would I
handle a cast in python.

TIA


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