[Python] How to extract scores in a PGN file using python chess.pgn.read_game function

PGN with scores like this:

1. e4 {+0.42/27 1.6s} e5 {-0.21/26 5.4s}
2. Nf3 {+0.34/22 0.94s} Nc6 {-0.16/19 0.37s}
3. Bb5 {+0.35/27 2.1s} Nf6 {-0.19/26 0.80s}
4. O-O {+0.33/22 0.56s} Nxe4 {-0.16/26 0.92s}
5. Re1 {+0.29/27 1.0s} Nd6 {-0.19/24 0.66s}
6. Nxe5 {+0.32/24 0.59s, No result} *


my code is as follows:

self.move_stack = []

with open(file_path) as f:
game = chess.pgn.read_game(f)
if game:
self.board = game.board()
self.move_stack = list(game.mainline_moves())


It can extract moves, but I don't know how to extract the scores like 0,42.

I have read the documents about how to parse PGN file. It says eval() should work. But I tried with game.eval() and game.variations[0].eval(), both of them didn't work.

game.variations[0].comment can get the whole comment (+0.42/27 1.6s). I just want the first part 0.42.

finally, I managed to use a stupid way to get the scores.

i=0
for x in move_comment:
if x!= "/":
i=i+1
else:
break
original_score=move_comment[0:i]
The_original_scores.append(float(original_score))


There must be a simple way to do it.

Continue reading...