Python中类__init__函数外部的所有变量都是类变量，而内部的所有变量都是实例变量。通过检查以下代码，可以更好地理解类变量和实例变量之间的区别
class MyClass: stat_elem = 456 def __init__(self): self.object_elem = 789 c1 = MyClass()c2 = MyClass() #两个元素的初始值 >>> print c1.stat_elem, c1.object_elem 456 789 >>> print c2.stat_elem, c2.object_elem 456 789 #让我们尝试更改静态元素 MyClass.static_elem = 888 >>> print c1.stat_elem, c1.object_elem 888 789 >>> print c2.stat_elem, c2.object_elem 888 789 #现在，让我们尝试更改object元素 c1.object_elem = 777 >>> print c1.stat_elem, c1.object_elem 888 777 >>> print c2.stat_elem, c2.object_elem 888 789