方法 __getattr__ 不是从父类继承的
尝试子类 mechanize.Browser 类：
from mechanize import Browser
class LLManager(Browser, object):
IS_AUTHORIZED = False
def __init__(self, login = "", passw = "", *args, **kwargs):
super(LLManager, self).__init__(*args, **kwargs)
self.set_handle_robots(False)
但是当我做这样的事情时：
lm["Widget[LinksList]_link_1_title"] = anc
然后我收到错误：
Traceback (most recent call last):
File "<pyshell#8>", line 1, in <module>
lm["Widget[LinksList]_link_1_title"] = anc
TypeError: 'LLManager' object does not support item assignment
浏览器类已重写方法 __getattr__ ，如下所示：
def __getattr__(self, name):
# pass through _form.HTMLForm methods and attributes
form = self.__dict__.get("form")
if form is None:
raise AttributeError(
"%s instance has no attribute %s (perhaps you forgot to "
".select_form()?)" % (self.__class__, name))
return getattr(form, name)
为什么我的类或实例没有像父类中那样获取此方法？
Trying to subclass mechanize.Browser class:
from mechanize import Browser
class LLManager(Browser, object):
IS_AUTHORIZED = False
def __init__(self, login = "", passw = "", *args, **kwargs):
super(LLManager, self).__init__(*args, **kwargs)
self.set_handle_robots(False)
But when I make something like this:
lm["Widget[LinksList]_link_1_title"] = anc
then I get an error:
Traceback (most recent call last):
File "<pyshell#8>", line 1, in <module>
lm["Widget[LinksList]_link_1_title"] = anc
TypeError: 'LLManager' object does not support item assignment
Browser class have overridden method __getattr__ as shown:
def __getattr__(self, name):
# pass through _form.HTMLForm methods and attributes
form = self.__dict__.get("form")
if form is None:
raise AttributeError(
"%s instance has no attribute %s (perhaps you forgot to "
".select_form()?)" % (self.__class__, name))
return getattr(form, name)
Why my class or instance don't get this method as in parent class?
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不要从对象继承，mechanize.Browser 不使用新样式类。这应该按预期工作。
Don't inherit from object, mechanize.Browser doesn't use new style classes. This should work as expected.
您需要重写 __setattr__ 来支持这种方式的赋值。
__getattr__仅用于检索You need to override
__setattr__to support assignment in this fashion.__getattr__is only for retrieval物品和属性之间存在差异。使用
ob[item]访问项目，使用ob.item访问属性。定义项目分配的方法是__getitem__和__setitem__，如果您要设置项目（而不仅仅是访问它们），则需要第二个方法。方法__getattr__、__setattr__和__getattribute__处理属性，在这里对您没有帮助，此外，应该避免最后两个，因为它们使你的类的创建变得过于复杂。There's difference between items and attributes. Items are accessed using
ob[item], while attributes are accessed usingob.item. The methods that define item assignment are__getitem__and__setitem__, and the second is required if you're going to set items, not only access them. The methods__getattr__,__setattr__and__getattribute__deal with attributes, and don't help you here, and besides, the last two should be avoided because they complicate the creation of your class too much.