嵌套类本身未定义
问题描述：
以下代码成功打印OK:
class B(object):
def __init__(self):
super(B, self).__init__()
print 'OK'
class A(object):
def __init__(self):
self.B()
B = B
A()
，但以下应该与上面的工作原理相同的内容引发了NameError: global name 'B' is not defined
but the following which should work just as same as above one raises NameError: global name 'B' is not defined
class A(object):
def __init__(self):
self.B()
class B(object):
def __init__(self):
super(B, self).__init__()
print 'OK'
A()
为什么?
答
B在A类的范围内可用-请使用A.B:
B is available in the scope of A class - use A.B:
class A(object):
def __init__(self):
self.B()
class B(object):
def __init__(self):
super(A.B, self).__init__()
print 'OK'
A()
请参阅有关 Python作用域和命名空间的文档.