import cmath
import math as rmath
from types import *
 
class MathSelector(object):
    def __init__(self, fn):
        self.fn = fn
    def __call__(self,*args):
        try:
            return getattr(rmath,self.fn)(*args)
        except:
            return getattr(cmath,self.fn)(*args)
 
class Math(object):
    def __getattr__(self, fn):
        return MathSelector(fn)
 
math = Math()
 
print math.sqrt(-1)
print math.exp(complex(0,1))
print math.sin(2.5)

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