Dynamic Operator Overloading on dict classes in Python
- by Ishpeck
I have a class that dynamically overloads basic arithmetic operators like so...
import operator
class IshyNum:
def __init__(self, n):
self.num=n
self.buildArith()
def arithmetic(self, other, o):
return o(self.num, other)
def buildArith(self):
map(lambda o: setattr(self, "__%s__"%o,lambda f: self.arithmetic(f, getattr(operator, o))), ["add", "sub", "mul", "div"])
if __name__=="__main__":
number=IshyNum(5)
print number+5
print number/2
print number*3
print number-3
But if I change the class to inherit from the dictionary (class IshyNum(dict):) it doesn't work. I need to explicitly def __add__(self, other) or whatever in order for this to work. Why?
