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# Copyright 2013 The Chromium Authors
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
def memoize(fn):
'''Decorates |fn| to memoize.
'''
memory = {}
def impl(*args, **optargs):
full_args = args + tuple(optargs.items())
if full_args not in memory:
memory[full_args] = fn(*args, **optargs)
return memory[full_args]
return impl
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