在Python中定义类变量的正确方法是什么？
类变量是在__init__方法之外声明的变量。这些是静态元素，也就是说，它们属于类而不是类实例。这些类变量由该类的所有实例共享。类变量的示例代码
示例
class MyClass:
__item1 = 123
__item2 = "abc"
def __init__(self):
#pass or something else使用更多代码，您将更加清楚地了解-
class MyClass:
stat_elem = 456
def __init__(self):
self.object_elem = 789
c1 = MyClass()c2 = MyClass()# Initial values of both elements
>>> print c1.stat_elem, c1.object_elem
456 789
>>> print c2.stat_elem, c2.object_elem
456 789
# Let's try changing the static element
MyClass.static_elem = 888
>>> print c1.stat_elem, c1.object_elem
888 789
>>> print c2.stat_elem, c2.object_elem
888 789
# Now, let's try changing the object element
c1.object_elem = 777
>>> print c1.stat_elem, c1.object_elem
888 777
>>> print c2.stat_elem, c2.object_elem
888 789