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bidict.py
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bidict.py
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# bidict.py
#
# Bidirectional map
class BiDict:
def __init__(self):
self.forward={}
self.backward={}
def Add(self, one, two):
self.forward[one]=two
self.backward[two]=one
def __len__(self):
return len(self.forward)
def __getitem__(self, key):
return self.GetForward(key)
def __delitem__(self, key):
if self.forward.has_key(key):
del self.backward[self.forward[key]]
del self.forward[key]
else:
del self.forward[self.backward[key]]
del self.backward[key]
def GetForward(self, key):
return self.forward[key]
def HasForward(self, key):
return self.forward.has_key(key)
def GetBackward(self, key):
return self.backward[key]
def HasBackward(self, key):
return self.backward.has_key(key)