class_docstr: Connect4 Board.
docstr: Create copy of board with specified pieces.
docstr_tok: ["Create","copy","of","board","with","specified","pieces","."]
code: def with_np_pieces(self, np_pieces):
      """Create copy of board with specified pieces."""
      if np_pieces is None:
          np_pieces = self.np_pieces
      return Board(self.height, self.width, self.win_length, np_pieces)
  
imports: import numpy
  from collections import namedtuple
label_desc: Use image node_id 6 for calling the Board obj's underlying member method code with example usage: obj.with_np_pieces(np_pieces) and returns: Board