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35 lines
801 B
Python
35 lines
801 B
Python
import types
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def flatten(tup):
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elts = []
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for elt in tup:
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if type(elt) == types.TupleType:
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elts = elts + flatten(elt)
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else:
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elts.append(elt)
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return elts
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class Set:
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def __init__(self):
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self.elts = {}
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def __len__(self):
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return len(self.elts)
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def add(self, elt):
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self.elts[elt] = elt
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def elements(self):
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return self.elts.keys()
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def has_elt(self, elt):
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return self.elts.has_key(elt)
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def remove(self, elt):
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del self.elts[elt]
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class Stack:
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def __init__(self):
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self.stack = []
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self.pop = self.stack.pop
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def __len__(self):
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return len(self.stack)
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def push(self, elt):
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self.stack.append(elt)
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def top(self):
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return self.stack[-1]
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