diff options
| -rw-r--r-- | ranger/ext/lazy_property.py | 31 |
1 files changed, 16 insertions, 15 deletions
diff --git a/ranger/ext/lazy_property.py b/ranger/ext/lazy_property.py index ccd1586e..bb54bd5e 100644 --- a/ranger/ext/lazy_property.py +++ b/ranger/ext/lazy_property.py @@ -9,32 +9,30 @@ class lazy_property(object): # pylint: disable=invalid-name,too-few-public-meth """A @property-like decorator with lazy evaluation >>> class Foo: + ... counter = 0 ... @lazy_property ... def answer(self): - ... print("calculating answer...") - ... return 2*3*7 + ... Foo.counter += 1 + ... return Foo.counter >>> foo = Foo() >>> foo.answer - calculating answer... - 42 + 1 >>> foo.answer - 42 + 1 >>> foo.answer__reset() >>> foo.answer - calculating answer... - 42 + 2 >>> foo.answer - 42 + 2 Avoid interaction between multiple objects: >>> bar = Foo() >>> bar.answer - calculating answer... - 42 + 3 >>> foo.answer__reset() >>> bar.answer - 42 + 3 """ def __init__(self, method): @@ -46,11 +44,14 @@ class lazy_property(object): # pylint: disable=invalid-name,too-few-public-meth if obj is None: # to fix issues with pydoc return None - def reset_function(): - setattr(obj, self.__name__, self) - del obj.__dict__[self.__name__] # force "__get__" being called + reset_function_name = self.__name__ + "__reset" + + if not hasattr(obj, reset_function_name): + def reset_function(): + setattr(obj, self.__name__, self) + del obj.__dict__[self.__name__] # force "__get__" being called + obj.__dict__[reset_function_name] = reset_function - obj.__dict__[self.__name__ + "__reset"] = reset_function result = self._method(obj) obj.__dict__[self.__name__] = result return result |