removed 1st edition code
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@@ -1,27 +0,0 @@
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class A:
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def ping(self):
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print('ping:', self)
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class B(A):
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def pong(self):
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print('pong:', self)
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class C(A):
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def pong(self):
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print('PONG:', self)
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class D(B, C):
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def ping(self):
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super().ping()
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print('post-ping:', self)
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def pingpong(self):
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self.ping()
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super().ping()
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self.pong()
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super().pong()
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C.pong(self)
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