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#!/usr/bin/env python

# coding=utf-8

class Calculator(object):

is_raise = False

def calc(self, express):

try:

return eval(express)

except ZeroDivisionError:

if self.is_raise:

print "zero can not be division."

else:

raise

if __name__ == "__main__":

c = Calculator()

c.is_raise = True

print c.calc("8/0")