How to initialize a python class variable outside of functions?

Question

I have a python function:

class MyClass:
   my_class_variable: str = Optional[None]

   @classmethod
   def initialize(cls):
      cls.my_class_variable = cls.some_function()

I plan to use it like:

x = MyClass.my_class_variable

How can I guarantee have my_class_variable to have initialized with a value, eg how can I force call initialize() ?

@Red they want my_class_variable to be a class variable, __init__ only works with instances — pho
– pho, Commented May 12, 2022 at 21:46
Does this answer your question? How to refer to class methods when defining class variables in Python? — pho
– pho, Commented May 12, 2022 at 21:49
Anyway, the way to guarantee is simply to write MyClass.initialize() after your class definition. — juanpa.arrivillaga
– juanpa.arrivillaga, Commented May 12, 2022 at 21:54
@user1008636 I think you meant to respond to Red with regards to __init__. In any case, as I already pointed out, the simplest way to guaratnee initialize has been called is to call it. So after the class definition for class MyClass, just write MyClass.initialize() after. — juanpa.arrivillaga
– juanpa.arrivillaga, Commented May 13, 2022 at 0:40

baskettaz · Accepted Answer · 2022-05-13 07:31:00Z

0

you could do something like :

def dec(cls):
    cls.my_class_var = cls.some_func()
    return cls
@dec
class MyClass:
    my_class_var = ""

    @classmethod
    def some_func(cls):
        return "Cool :)"

print(MyClass.my_class_var) --> Cool :)

Another option would be to use a metaprogramming, but as long as there is only one simple thing to do, I would use a decorator :)

answered May 13, 2022 at 7:31

baskettaz

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