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class parent(object): def implicit(self): print("Parent implicit()") def override(self): print("Parent override()") def altered(self): print("Parent a 阅读全文
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class Song(): def __init__(self,lyrics): self.lyrics=lyrics def sing_a_song(self): for line in self.lyrics: print(line) happy=Song(["Happy birthday to you", "Happy... 阅读全文