未定义abstractmethod [英] abstractmethod is not defined
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问题描述
我无法运行此代码,因为遇到异常:
I cannot run this code, because I get the exception:
NameError: name 'abstractmethod' is not defined
File "C:\Tests\trunk\PythonTests\AbstractClasses.py", line 12, in <module>
class MyIterable:
File "C:\Tests\trunk\PythonTests\AbstractClasses.py", line 15, in MyIterable
@abstractmethod
from abc import ABCMeta
class Foo(object):
def __getitem__(self, index):
print '__get_item__ Foo'
def __len__(self):
print '__len__ Foo'
def get_iterator(self):
print 'get_iterator Foo'
return iter(self)
class MyIterable:
__metaclass__ = ABCMeta
@abstractmethod
def __iter__(self):
while False:
yield None
def get_iterator(self):
return self.__iter__()
@classmethod
def __subclasshook__(cls, C):
if cls is MyIterable:
if any("__iter__" in B.__dict__ for B in C.__mro__):
print "I'm in __subclasshook__"
return True
return NotImplemented
MyIterable.register(Foo)
x=Foo()
x.__subclasshook__()
我确定代码是可以的,因为我是从 http:/获得的/docs.python.org/library/abc.html
I'm sure that code is ok, because I got it from http://docs.python.org/library/abc.html
编辑
感谢您的回答,现在可以使用了,但是为什么
Thanks for answer, it works now, but why
print '__subclasshook__'
这不起作用吗?我没有进入调试I / 0
this doesn't work ? I don't get in Debug I/0
推荐答案
您仅导入了 ABCMeta
from abc import ABCMeta
还导入抽象方法
from abc import ABCMeta, abstractmethod
一切都应该没问题。
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