code: def dashed_line(self, x1,y1,x2,y2, dash_length=1, space_length=1):
          
          self._set_dash(dash_length, space_length)
          self.line(x1, y1, x2, y2)
          self._set_dash()
docs: Draw a dashed line. Same interface as line() except:
             - dash_length: Length of the dash
             - space_length: Length of the space between dashes