Sample Calc Utility | Python Fiddle

from __future__ import division

class Calc:
    result = 0.0
    
    def __init__(self):
        pass
    
    def add(self, x, y):
        self.result = x + y
        return (self.result)
    
    def minus(self, x, y):
        self.result = x - y
        return (self.result)
    
    def mul(self, x, y):
        self.result = x * y
        return (self.result)
    
    def div(self, x, y):
        if (y != 0):
        	self.result = x / y
        else:
            self.result = 0
            
        return (self.result)
    
    def getLastResult(self):
        return (self.result)
    
    def sort(self, arrNum):
        if type(arrNum) is list:
        	_arrNum = sorted(arrNum)
        	return (_arrNum)
        
        return (None)
    
if __name__ == '__main__':
    calc = Calc()
    
    print "3 + 5 = %d" % (calc.add(3, 5))
    print "%d - 2 = %d" % (calc.getLastResult(), calc.minus(calc.getLastResult(), 2))
    print "%d * 5 = %d" % (calc.getLastResult(), calc.mul(calc.getLastResult(), 5))
    print "%d / 7 = %.2f" % (calc.getLastResult(), calc.div(calc.getLastResult(), 7))
    
    arrNum = [5, 3, 8, 7, 4]
    print (calc.sort(arrNum))

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