init 函数中声明的实例变量和全局变量的区别

difference between instance variables and global variables declared in init function

class Car(object):
    def __init__(self):
        self.color = 'red' #var1
        global color 
        color= 'red' #var2

第一个变量和第二个变量有什么区别？

考虑这段代码：

color = 'blue' 

class Car(object):
    def __init__(self):
        self.color = 'green'
        global color 
        color= 'red'

print(color)       # prints blue
car = Car()
print(car.color)   # prints green
print(color)       # prints red