乙個物件導向的簡單計算器 python

#coding=utf8

import string
def count(numa, numb, operator):
try:
numbera = string.atof(numa)
numberb = string.atof(numb)
except:
exit("input error,please check it number a :'%s' -- number b:'%s'" % (numa, numb))
op = operationfactory.createoperate(operator)
op.seta(numbera)
op.setb(numberb)
return op.getresult()
class operationfactory(object):
'''工廠方法，生成對應操作類
'''@staticmethod
def createoperate(operate):
operators = 
try:
return operators[operate]
except keyerror:
exit("temporarily does not support '%s' operator" % operate)
class operation(object):
'''操作父類，在需要時可以增加相應子類，如取模類operationmod,複數類等，增加子類不影響其他子類的運算，
達到封裝的目的
'''_numbera = 0
_numberb = 0
def numbera(self):
return self._numbera
def numberb(self):
return self._numberb
def getresult(self):
return 0
def seta(self, a):
self._numbera = a
def setb(self, b):
self._numberb = b
class operationadd(operation):
def getresult(self):
result = self.numbera() + self.numberb()
return result
class operationsub(operation):
def getresult(self):
result = self.numbera() - self.numberb()
return result
class operationmul(operation):
def getresult(self):
result = self.numbera() * self.numberb()
return result
class operationdiv(operation):
def getresult(self):
result = self.numbera() / self.numberb()
return result
if __name__ == '__main__':
left = raw_input('number a: ')
sign = raw_input('請輸入 + - * / :')
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