class Setter:
    def __init__(self, parent, current=0, prefixes=()):
        self.parent = parent
        self.prefixes = prefixes

    def __getattr__(self, attribute: str):
        self.prefixes += (attribute,)
        if self.prefixes[self.current] == 'is_a':
            setattr(self.parent, 'is_a_' + 'attribute', True)
        elif self.prefixes[self.current] == 'is_not_a':
            setattr(self.parent, 'is_a_' + 'attribute', False)
        elif self.prefixes[self.current] == 'is_the':
            return Setter(self.parent, self.current + 1, self.prefixes)
        elif self.prefixes[self.current - 1] == 'is_the':
            return Setter(self, parent, self.current + 1, self.prefixes)
        elif self.prefixes[self.current - 2] == 'is_the':
            setattr(self.parent, self.prefixes[self.current - 1], self.prefixes[self.current])


class Thing:
    def __init__(self, name):
        self.name = name

    def __getattr__(self, prefix: str) -> Setter:
        return Setter(self, 0, (prefix,))


jane = Thing('Jane')
assert jane.name == 'Jane'

jane.is_a.person
jane.is_a.woman
jane.is_not_a.man

assert jane.is_a_person
assert jane.is_a_woman
assert not jane.is_a_man

jane.is_the.parent_of.joe
assert jane.parent_of == 'joe'