License
License is indicated in the project metadata (typically one or more of the Trove classifiers). For more details, see this explanation.
Backport of functools.lru_cache from Python 3.3 as published at ActiveState.
Usage
Consider using this technique for importing the 'lru_cache' function:
try: from functools import lru_cache except ImportError: from backports.functools_lru_cache import lru_cache