Marten Lienen <[email protected]> added the comment:
An implementation based on cached_property (that therefore also inherits its
locking problem) that does not create a circular reference and copies
attributes (docs etc.) from the decorated function would be as follows (based
on the WeaklyBoundMethod from this PR).
def cached_method_inner(func, lru_args):
lru_args.setdefault("maxsize", None)
def binder(self):
method = WeaklyBoundMethod(func.__get__(self))
cache = lru_cache(**lru_args)
cached = cache(method)
update_wrapper(cached, func)
return cached
prop = cached_property(binder)
update_wrapper(prop, func)
return prop
def cached_method(func=None, /, **lru_args):
if func is not None:
return cached_method_inner(func, lru_args)
else:
def decorator(late_func):
return cached_method_inner(late_func, lru_args)
return decorator
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<https://bugs.python.org/issue45588>
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