AI_PRO/Field.py

class Field:
    def __init__(self, __horizontal, __vertical, __state):
        self.horizontal = __horizontal
        self.vertical = __vertical
        self.__state = __state

    @property
    def state(self):
        return self.__state

    @state.setter
    def state(self, state):
        if state == 0 or state == 1 or state == 2 or state == 3 or state == 4:
            self.__state = state