Declare class attributes outside of constructor

[LouisCarpentier42]

Currently, the properties of a class are defined within the constructor. Something like:

class Example:

    def __init__(self, parameter: type1):
        self.parameter: type = parameter
        self.learned_parameter_: type2 = None

In this case, we need to assign a value to the learned parameters (e.g., None), even though they do not exist yet. To deal with this more elegantly, the structure of the classes should be changed to:

class Example:
    parameter: type1
    learned_parameter_ : type2

    def __init__(self, parameter: type1):
        self.parameter = parameter