class Base:
    def __init__(self, props=list(), foo='foo base'):
        self.props = props
        self.foo = foo
    
    def insert_prop(self, i):
        self.props.append(i)


class Sub1(Base):
    pass


if __name__ == '__main__':
    base = Base()

    base.insert_prop(1)
    base.insert_prop(2)

    print('base props before base2, 3 creation:', base.props)

    base2 = Base()
    base3 = Base([41, 42])

    print('base props after base2, 3 creation:', base.props)
    print('base2 props after base2, 3 creation:', base2.props)
    print('base3 props after base2, 3 creation:', base3.props)

    base2.insert_prop(51)
    base3.insert_prop(61)

    print('base props after insertion:', base.props)
    print('base2 props after insertion:', base2.props)
    print('base3 props after insertion:', base3.props)
    
    print('base foo before assignment:', base.foo)
    
    base.foo = 'foo base in wild'

    print('base foo after assignment:', base.foo)

    print('base props before sub creation:', base.props)

    sub1 = Sub1()
    sub2 = Sub1(list(), 'foo sub2 in creation')

    print('sub1 foo after creation:', sub1.foo)
    print('sub2 foo after creation:', sub2.foo)

    sub1.foo = 'foo sub1'
    print('base foo after sub1 assignment:', base.foo)
    print('sub1 foo after sub1 assignment:', sub1.foo)
    print('sub2 foo after sub1 assignment:', sub2.foo)
    
    sub2.foo = 'foo sub2'
    print('base foo after sub2 assignment:', base.foo)
    print('sub1 foo after sub2 assignment:', sub1.foo)
    print('sub2 foo after sub2 assignment:', sub2.foo)

    print('sub1 props after sub creation', sub1.props)
    print('sub2 props after sub creation', sub2.props)
    print('base props after sub creation:',base.props)
    
    sub1.insert_prop(13)
    sub1.insert_prop(14)
    
    print('sub1 props after sub1 insertion', sub1.props)
    print('sub2 props after sub1 insertion', sub2.props)
    print('base props after sub1 insertion:',base.props)

    sub2.insert_prop(23)
    sub2.insert_prop(24)

    print('sub1 props after sub2 insertion', sub1.props)
    print('sub2 props after sub2 insertion', sub2.props)
    print('base props after sub2 insertion', base.props)