comparison.py

class Line(object):
    def __init__(self, a, b):
        self.a = a
        self.b = b
    
    def __eq__(self, other):
        return all((
            self.a == other.a,
            self.b == other.b
        ))
    
    def __le__(self, other):
        return all((
            other.a <= self.a <= other.b,
            other.a <= self.b <= other.b,
        ))
    
    def __lt__(self, other):
        return all((
            self != other,
            self <= other,
        ))


assert Line(3, 4) < Line(1, 6)
assert Line(4, 9) < Line(4, 10)
assert Line(4, 9) < Line(3, 9)
assert not(Line(7, 8) < Line(7, 8))