I ve got a decorator function I m applicable to function within a group. 更正者应对照<代码>_api成员变量进行核对。 然而,当我尝试这样做时,我拿到了“<>条码>全球名称自称”的错误。 什么是正确的方式?
def requires_api(fn):
def wrapped(*args, **kwargs):
if self._api is not None:
return fn(*args, **kwargs)
else:
return None
return wrapped
@requires_api
def do_something(self):
...
您的推荐见。 is。 使用<代码>args[0],或将其改成:
def wrapper(self, *args, **kwargs):
# ...
当然,如果你这样做,你通过总结职能发出的呼吁也应包括<条码>本身<>。
变化
if self._api is not None:
页: 1
if hasattr(args[0], _api ):
args[0] has self. hasattr is the right way 页: 1 check for an attribute.
If you try 页: 1 access an attribute that does not exist, (if self._api does not exist) you will generate an AttributeError.
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