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class Cache:

def __init__( self, func ):

self.dict = {}

self.func = func

def __setitem__( self, key, value ):

self.dict[ key ] = value

def __getitem__( self, key ):

try:

return self.dict[ key ]

except KeyError:

value = self.func( key )

self.dict[ key ] = value

return value

def reset( self ):

self.dict = {}