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    <p>I asume this is for the school, so this maybe can help you.</p> <pre><code> #!/usr/bin/env python import re #put the logic in an object like enviroment class CalculatorProto(object): def __init__(self, numberone, numbertwo): """ initialize the data """ self.firsn = numberone self.twon = numbertwo def Verifynumber(self): """ verify is you pass abs numbers """ numbers = re.compile("^[0-9]+$") if numbers.search(self.firsn) and numbers.search(self.twon): self.firsn = int(self.firsn) self.twon = int(self.twon) return True else: return False def sum(self): """ manage sum """ rsum = self.firsn + self.twon return rsum def rest(self): """ manage rest """ if self.firsn &gt; self.twon: rrest = self.firsn - self.twon return rrest else: rrest = self.twon - self.firsn return rrest def div(self): """ manage div """ if int(self.firsn) &gt; int(self.twon): if self.twon != 0: rdiv = self.firsn / self.twon return rdiv return "Is not good idea div a number by 0" else: if self.firsn != 0: rdiv = self.twon / self.firsn return rdiv return "Is not good idea div a number by 0" def mul(self): rmul = self.firsn * self.twon return rmul if __name__ == "__main__": #here you cant write you small interface print "Enter two numbers, and a operation please" o = raw_input("One: ") t = raw_input("Two: ") operation = raw_input("Operation: ") while operation not in ("sum", "div", "rest", "mul"): print "WTF?? Enter a valid operation" print "sum\ndiv\nrest\nor mul" operation = raw_input("Operation: ") cal = CalculatorProto(o, t) if cal.Verifynumber(): exec("print cal.%s()" % operation) else: print "Please insert absolute numbers" </code></pre> <p>You cant modify this, for a more complex manage.</p>
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