问题描述
假设我有一个类，调用 class1，有3个类变量 var1，var2，var3， __ init __ 方法将传递的参数分配给类变量：
Suppose I have a class, call it class1, with 3 class variables var1,var2,var3, and __init__ method, which assigns passed arguments to the class variables:
class class1(object):
var1 = 0
var2 = 0
var3 = 0
def __init__(self,a,b,c):
class1.var1 = a
class1.var2 = b
class1.var3 = c
现在我要创建同一个类的两个实例：
Now I'm going to make two instances of the same class:
obj1 = class1(1,2,3)
obj2 = class1(4,5,6)
现在，让我们来看看变量值：
And now, let's take a look at variables values:
print (obj1.var1, obj1.var2,obj1.var3)
4 5 6
print (obj2.var1, obj2.var2,obj2.var3)
4 5 6
不应 obj1 有值1,2,3吗？为什么第二个实例的 __ init __ 方法更改第一个实例中的值（ obj1 ）？
Shouldn't obj1 have values 1,2,3 ? Why __init__ method of the second instance changes vaues in the first instance(obj1)? And how to make two independent separate instances of a class?
推荐答案
在类定义中声明的变量，但不在内部方法，将是类变量。
Variables declared in the class definition, but not inside a method, will be class variables. In other words, they will be the same for the whole class.
要解决这个问题，你可以在 __ init __ 方法，因此它们变成实例变量：
To solve this you could declare them in the __init__ method, so they become instance variables:
class class1():
def __init__(self,a,b,c):
self.var1 = a
self.var2 = b
self.var3 = c
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