本文整理汇总了Python中functools.cached_property方法的典型用法代码示例。如果您正苦于以下问题：Python functools.cached_property方法的具体用法？Python functools.cached_property怎么用？Python functools.cached_property使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类functools的用法示例。
在下文中一共展示了functools.cached_property方法的3个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的Python代码示例。
示例1: __get__
# 需要导入模块: import functools [as 别名]
# 或者: from functools import cached_property [as 别名]
def __get__(
self, instance: None, owner: Optional["Type[_S]"] = ...
) -> "cached_property[_S, _T]":
raise NotImplementedError() 示例2: __set_name__
# 需要导入模块: import functools [as 别名]
# 或者: from functools import cached_property [as 别名]
def __set_name__(self, owner, name):
if self.attrname is None:
self.attrname = name
elif name != self.attrname:
raise TypeError(
"Cannot assign the same cached_property to two different names "
f"({self.attrname!r} and {name!r})."
) 示例3: __get__
# 需要导入模块: import functools [as 别名]
# 或者: from functools import cached_property [as 别名]
def __get__(self, instance, owner=None):
if instance is None:
return self
if self.attrname is None:
raise TypeError(
"Cannot use cached_property instance without calling __set_name__ on it.")
try:
cache = instance.__dict__
except AttributeError: # not all objects have __dict__ (e.g. class defines slots)
msg = (
f"No '__dict__' attribute on {type(instance).__name__!r} "
f"instance to cache {self.attrname!r} property."
)
raise TypeError(msg) from None
val = cache.get(self.attrname, _NOT_FOUND)
if val is _NOT_FOUND:
with self.lock:
# check if another thread filled cache while we awaited lock
val = cache.get(self.attrname, _NOT_FOUND)
if val is _NOT_FOUND:
val = self.func(instance)
try:
cache[self.attrname] = val
except TypeError:
msg = (
f"The '__dict__' attribute on {type(instance).__name__!r} instance "
f"does not support item assignment for caching {self.attrname!r} property."
)
raise TypeError(msg) from None
return val