Question

我如何实现这样的目标？

class myClass(static_variable):
    static_var = static_variable

    def __init__(self, x):
        self.x = x + static_var

obj = myClass(static_variable = 3)(x = 5)
#obj.x = 8

[EDIT]
更好的问题是“如何在运行时初始化类静态变量？”，但是python被解释了，所以我也不知道这是否是更好的问题。

Answer 1

class语句在运行时进行评估，并且可以访问其封闭范围。这样可以从上下文或通过执行其他代码来初始化类（“静态”）属性。

static_variable = 32

class myClass:
    cvar1 = static_variable  # lookup variable from enclosing scope
    cvar2 = random.random()  # call function to initialise attribute

    def __init__(self, x):
        self.x = x + self.cvar1 + self.cvar2

Answer 2

您的第二行将解决问题。您无需随后在构造函数中分配它。

class YourClass:
    static_var = 3*6 . # <--- assigns the static variable to a computed value, 18 in this case
    def __init__(self):
        pass

instance = YourClass()
print(instance.static_var)  # <--- this will print 18
print(YourClass.static_var) # <--- this also prints 18

将静态变量作为参数传递给Class？

2 个答案: