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- """:mod:`methodtools` --- functools for methods
- ===============================================
- Expand functools features to methods, classmethods, staticmethods and even for
- (unofficial) hybrid methods.
- For now, methodtools only provides :func:`methodtools.lru_cache`.
- Use methodtools module instead of functools module. Than it will work as you
- expected - cache for each bound method.
- .. code-block:: python
- from methodtools import lru_cache
- class A(object):
- # cached method. the storage lifetime follows `self` object
- @lru_cache()
- def cached_method(self, args):
- ...
- # cached classmethod. the storage lifetime follows `A` class
- @lru_cache() # the order is important!
- @classmethod # always lru_cache on top of classmethod
- def cached_classmethod(self, args):
- ...
- # cached staticmethod. the storage lifetime follows `A` class
- @lru_cache() # the order is important!
- @staticmethod # always lru_cache on top of staticmethod
- def cached_staticmethod(self, args):
- ...
- @lru_cache() # just same as functools.lru_cache
- def cached_function():
- ...
- """
- import functools
- from wirerope import Wire, WireRope
- __version__ = '0.4.7'
- __all__ = 'lru_cache',
- if hasattr(functools, 'lru_cache'):
- _functools_lru_cache = functools.lru_cache
- else:
- try:
- import functools32
- except ImportError:
- # raise AttributeError about fallback failure
- functools.lru_cache # install `functools32` to run on py2
- else:
- _functools_lru_cache = functools32.lru_cache
- class _LruCacheWire(Wire):
- def __init__(self, rope, *args, **kwargs):
- super(_LruCacheWire, self).__init__(rope, *args, **kwargs)
- lru_args, lru_kwargs = rope._args
- wrapper = _functools_lru_cache(
- *lru_args, **lru_kwargs)(self.__func__)
- self.__call__ = wrapper
- self.cache_clear = wrapper.cache_clear
- self.cache_info = wrapper.cache_info
- def __call__(self, *args, **kwargs):
- # descriptor detection support - never called
- return self.__call__(*args, **kwargs)
- def _on_property(self):
- return self.__call__()
- @functools.wraps(_functools_lru_cache)
- def lru_cache(*args, **kwargs):
- return WireRope(_LruCacheWire, wraps=True, rope_args=(args, kwargs))
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