Properties

# properties.py
# test python properties!


import math


class LittleThing():
    
    def __init__(self, state):
        self.state = state



class Thing():

    def __init__(self, state):
        self.children = [LittleThing(state) for i in range(5)]


    # handles reading: Thing.state
    @property
    def state(self):
        return any([c.state for c in self.children])


    # handles writing: Thing.state = val
    @state.setter
    def state(self, val):
        if not val:
            for c in self.children:
                c.state = False
        else:
            if not self.state:
                self.children[0].state = True


    def update(self, new_state):
        self.state = new_state




if __name__ == "__main__":
    t = Thing(True)
    print("My state is: ", t.state)


    for c in t.children:
        c.state = False
        
    print("My state is: ", t.state)
    

    t.state = True
    print("My state is: ", t.state)
    print("My children: ", [c.state for c in t.children])