code: def x_tic_points(self, interval):
          "Return the list of X values for which tick marks and grid lines are drawn."
          if type(interval) == FunctionType:
              return interval(*self.x_range)
  
          return self.x_coord.get_tics(self.x_range[0], self.x_range[1], intervalf x_tic_points(self, interval):
          "Return the list of X values for which tick marks and grid lines are drawn."
          if type(interval) == FunctionType:
              return interval(*self.x_range)
  
          return self.x_coord.get_tics(self.x_range[0], self.x_range[1], interval)
docs: Return the list of X values for which tick marks and grid lines are drawn.