how to change the class variable depending on the variable from the constructor?

I want to change the class variable depending on the variable from the constructor.

In the case of the code below, I expect the console to show Yes but the result is No.

How could I change the variable by the constructor?

here is the code:

class MyClass:
    is_check = False

    def __init__(self, is_check):
        self.is_check = is_check

    if is_check:
        val = 'Yes'
    else:
        val = 'No'


print(MyClass(True).val)

Python 3.8

>Solution :

The class definition should look like this –
There is an indentation issue as pointed out by @trincot
The variable var should be a object variable, as in make it self.var

The variable declaration has to be className.variable for it to not create an instance variable , and have only one variable for all objects of the class to use as in class variable. Pointed out by @juanpa.arrivillaga

class MyClass:
    is_check = False

    def __init__(self, is_check):
        MyClass.is_check = is_check
        

        if is_check:
            self.val = 'Yes'
        else:
            self.val = 'No'