两种方法都不一定正确或不正确，它们只是两种不同的类元素：
您将通过一些代码更清楚地看到它：
class MyClass:
static_elem = 123
def __init__(self):
self.object_elem = 456
c1 = MyClass()
c2 = MyClass()
# Initial values of both elements
>>> print c1.static_elem, c1.object_elem
123 456
>>> print c2.static_elem, c2.object_elem
123 456
# Nothing new so far ...
# Let's try changing the static element
MyClass.static_elem = 999
>>> print c1.static_elem, c1.object_elem
999 456
>>> print c2.static_elem, c2.object_elem
999 456
# Now, let's try changing the object element
c1.object_elem = 888
>>> print c1.static_elem, c1.object_elem
999 888
>>> print c2.static_elem, c2.object_elem
999 456
如您所见，当我们更改class元素时，这两个对象都发生了变化。但是，当我们更改对象元素时，另一个对象保持不变。
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