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  1. class Cal(object):
  2.     _history = []
  3.     def __init__(self, v1, v2):
  4.         if isinstance(v1, int):
  5.             self.v1 = v1
  6.         if isinstance(v2, int):
  7.             self.v2 = v2
  8.     def add(self):
  9.         result = self.v1+self.v2
  10.         Cal._history.append("add : %d+%d=%d" % (self.v1, self.v2, result))
  11.         return result
  12.     def subtract(self):
  13.         result = self.v1-self.v2
  14.         Cal._history.append("subtract : %d-%d=%d" % (self.v1, self.v2, result))
  15.         return result
  16.     def setV1(self, v):
  17.         if isinstance(v, int):
  18.             self.v1 = v
  19.     def getV1(self):
  20.         return self.v1
  21.     @classmethod
  22.     def history(cls):
  23.         for item in Cal._history:
  24.             print(item)
  25.     def info(self):
  26.         return "Cal => v1 : %d, v2 : %d" % (self.v1, self.v2)
  27. class CalMultiply(Cal):
  28.     def multiply(self):
  29.         result = self.v1*self.v2
  30.         Cal._history.append("multiply : %d*%d=%d" % (self.v1, self.v2, result))
  31.         return result
  32.     def info(self):
  33.         return "CalMultiply => %s" % super().info()
  34. class CalDivide(CalMultiply):
  35.     def divide(self):
  36.         result = self.v1/self.v2
  37.         Cal._history.append("divide : %d/%d=%d" % (self.v1, self.v2, result))
  38.         return result
  39.     def info(self):
  40.         return "CalDivide => %s" % super().info()
  41.  
  42. c0 = Cal(30, 60)
  43. print(c0.info())
  44. c1 = CalMultiply(10,10)
  45. print(c1.info())
  46. c2 = CalDivide(20,10)
  47. print(c2.info())
  48.  
Success #stdin #stdout 0.02s 9984KB
comments (?)
stdin 
Standard input is empty
stdout 
Cal => v1 : 30, v2 : 60
CalMultiply => Cal => v1 : 10, v2 : 10
CalDivide => CalMultiply => Cal => v1 : 20, v2 : 10
https://ideone.com/NMRP0e
language:
Python 3 (python  3.9.5)
created:
9 years ago
visibility:
public

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