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48 lines
1.0 KiB
48 lines
1.0 KiB
# duck typing example taken from wikipedia
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# https://de.wikipedia.org/wiki/Duck-Typing
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class Bird:
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"Birds have a name that they return in string represention"
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def __init__(self, name):
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self.name = name
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def __str__(self):
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return self.__class__.__name__+' '+self.name
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class Duck(Bird):
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"Ducks are birds which can quak"
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def quak(self):
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print(str(self)+': quak')
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class Frog:
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"Frogs also can quak"
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def quak(self):
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print(str(self)+': quak')
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def main():
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ducks = [Bird('Gustav'), Duck('Donald'), object()]
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for duck in ducks:
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# exception handling when object hasn't quak method
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try:
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duck.quak()
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except AttributeError:
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print('No duck:', duck)
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ducks.append(Frog())
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for duck in ducks:
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# we also can use hasattr() function instead of exception handling
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if hasattr(duck, 'quak'):
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duck.quak()
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else:
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print('No duck:', duck)
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if __name__ == "__main__":
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main()
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