30 lines
714 B
Python
30 lines
714 B
Python
import math
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class Shape:
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def __init__(self,color):
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self.color = color
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def area(self):
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return 0
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def __str__(self):
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return f'color is {self.color}'
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class Circle(Shape):
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def __init__(self,color,r):
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super().__init__(color)
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self.r = r
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def area(self):
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return self.r**2*math.pi
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class Retangle(Shape):
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def __init__(self,color,a,b):
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# super().__init__(color)
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self.color = color
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self.a = a
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self.b = b
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def area(self):
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return self.a*self.b/2
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s = Shape('red')
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c1 = Circle('green',13)
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r = Retangle('green',13,22)
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print(s,c1,r)
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print(r.area())
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# 一定不要忘记在子类的init方法中调用super()._init_() |