(self, pos)
pos: (x1, x2, y1, y2)
pos: (x1, x2, y1, y2)
pos : ( x1 x2 y1 y2 )
def __init__(self, pos):
    """pos: (x1, x2, y1, y2)"""
    self.set_pos(pos)
def __init__ ( self , pos ) : self . set_pos ( pos )