code: def numpy_formatter(_, vertices, codes=None):
      
      if codes is None:
          return vertices
      numpy_vertices = []
      for vertices_, codes_ in zip(vertices, codes):
          starts = np.nonzero(codes_ == MPLPATHCODE.MOVETO)[0]
          stops = np.nonzero(codes_ == MPLPATHCODE.CLOSEPOLY)[0]
          for start, stop in zip(starts, stops):
              numpy_vertices.append(vertices_[start:stop+1, :])
      return numpy_vertices
docs: `NumPy`_ style contour formatter.
  
      Contours are returned as a list of Nx2 arrays containing the x and y
      vertices of the contour line.
  
      For filled contours the direction of vertices matters:
  
      * CCW (ACW): The vertices give the exterior of a contour polygon.
      * CW: The vertices give a hole of a contour polygon.  This hole will
          always be inside the exterior of the last contour exterior.
  
      .. note:: This is the fastest format.
  
      .. _NumPy: http://www.numpy.org