Polymorphism

Different classes respond to the same method call in their own way.

Easy

class Led:    
    def power(self): return 0.06
class Motor:  
    def power(self): return 12.0

for device in (Led(), Motor()):
    print(device.power())      # works for any object with .power()

In Python this is mostly duck typing: "if it walks like a duck…".

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