Reputation: 253
I am using the python chess module. On the website, it shows that you can check if a move is legal by using
import chess
board = chess.Board()
move = input("Enter a chess move: ")
if move in board.legal_moves:
# Some code to do if the move is a legal move
However, I want to be able to get a move from board.legal_moves
. When I try this:
print(board.legal_moves[0])
This returns the following error:
TypeError: 'LegalMoveGenerator' object is not subscriptable
How can I select a move as if I were using a list? Then, how would I use the selection as a move?
Upvotes: 5
Views: 11386
Reputation: 11
If you want the output as a simple list:
legal_moves_lst = [
board.san(move)
for move in board.legal_moves
]
print(legal_moves_lst)
Output:
['Nh3', 'Nf3', 'Nc3', 'Na3', 'h3', 'g3', 'f3', 'e3', 'd3', 'c3', 'b3', 'a3', 'h4', 'g4', 'f4', 'e4', 'd4', 'c4', 'b4', 'a4']
Upvotes: 1
Reputation: 9
Just use editing and eval function:
import chess # Import chess
board = chess.Board() # Create chess board
moves_t = str(board.legal_moves)[37:-1] # Get the tuple as string
moves_t = moves_t.replace(", ", "', '") # Converting all the SAN names into strings
moves_t = moves_t.replace("(", "('")
moves_t = moves_t.replace(")", "')")
moves_t = eval(moves_t) # Using eval function to turn into tuple
moves = [] # Creates list to store values
for i in moves_t: # Go through all values
moves.append(i) # Add them to empty list
Though this may be bad, it is possible.
Upvotes: -1
Reputation: 17176
Generate a list from the generator.
legal_moves = list(board.legal_moves)
Legal moves is now a list.
print(legal_moves)
[Move.from_uci('g1h3'), Move.from_uci('g1f3'), Move.from_uci('b1c3'),
Move.from_uci('b1a3'), Move.from_uci('h2h3'), Move.from_uci('g2g3'),
Move.from_uci('f2f3'), Move.from_uci('e2e3'), Move.from_uci('d2d3'),
Move.from_uci('c2c3'), Move.from_uci('b2b3'), Move.from_uci('a2a3'),
Move.from_uci('h2h4'), Move.from_uci('g2g4'), Move.from_uci('f2f4'),
Move.from_uci('e2e4'), Move.from_uci('d2d4'), Move.from_uci('c2c4'),
Move.from_uci('b2b4'), Move.from_uci('a2a4')]
Upvotes: 9
Reputation: 19320
The board.legal_moves
object is a generator, or more specifically a LegalMoveGenerator
. You can iterate over that object and it will yield something with each iteration. You can convert it to a list with list(board.legal_moves)
and then index it as normal.
import chess
board = chess.Board()
legal_moves = list(board.legal_moves)
legal_moves[0] # Move.from_uci('g1h3')
Upvotes: 10