import shapes

class Rhombus(shapes.Parallelogram):
    """Instances are a rhombus, which is a type of parallelogram with horizontal
    length l1 (and other length l1) whose bottom line starts d units to the
    right of the x-coordinate of the leftmost part of the rhombus, unless d < 0,
    in which case the top line starts d units to the right of the leftmost part
    of the rhombus."""
    
    def __init__(self, xp, yp, lp1, dp):
        """Constructor: a rhombus at (xp, yp) of side lengths lp1, leaning factor dp
        
        Precondition: xp, yp, lp1, and dp are all numbers (floats or ints).
        lp1 may not be negative"""
        # IMPLEMENT ME
        pass
    
    def __str__(self):
        """Returns: description of this rhombus"""
        return ('rhombus at (' + str(self.x) + ', ' + str(self.y) + '), side ' +
               str(self.l1) + ', distance ' + str(self.d) + ' from ' + str(self.x))


class Square(Rhombus):

    def __init__(self, xp, yp, l):
        """Constructor: a square at (xp, yp) of side length l"""
        # IMPLEMENT ME
        pass
        
    def __str__(self):
        """Returns: description of this square"""
        # IMPLEMENT ME
        return ('square at (' + str(self.x) + ', ' + str(self.y) +
                '), side ' + str(self.l1))