class_docstr: Connect4 Board.
docstr: Any zero value in top row in a valid move
docstr_tok: ["Any","zero","value","in","top","row","in","a","valid","move"]
code: def get_valid_moves(self):
      "Any zero value in top row in a valid move"
      return self.np_pieces[0] == 0
  
imports: import numpy
  from collections import namedtuple
label_desc: Use image node_id 3 for calling the Board obj's underlying member method code with example usage: obj.get_valid_moves() and returns: unknown