全局变量Python类

| 在python中定义具有类范围的全局变量的正确方法是什么? 来自C / C ++ / Java背景,我认为这是正确的:
class Shape:
    lolwut = None

    def __init__(self, default=0):
        self.lolwut = default;
    def a(self):
        print self.lolwut
    def b(self):
        self.a()
    
已邀请:
        您所拥有的是正确的,尽管您不会将其称为全局,但它是一个类属性,可以通过类“ѭ1”或实例(例如)访问。
shape.lolwut
,但在设置时要小心,因为它将设置实例级别属性而不是类属性
class Shape(object):
    lolwut = 1

shape = Shape()

print Shape.lolwut,  # 1
print shape.lolwut,  # 1

# setting shape.lolwut would not change class attribute lolwut 
# but will create it in the instance
shape.lolwut = 2

print Shape.lolwut,  # 1
print shape.lolwut,  # 2

# to change class attribute access it via class
Shape.lolwut = 3

print Shape.lolwut,  # 3
print shape.lolwut   # 2 
输出:
1 1 1 2 3 2
有人可能会期望输出是
1 1 2 2 3 3
,但这是不正确的     

要回复问题请先登录注册