mainline node comment not work

[sugizo]

tested on google colab
pgn commented by chess engine downloaded from ubuntu repo and using chess annotator python module

import chess.pgn
f = open('test.pgn', "w")
f.write("""

[Annotator "Sjaak II 1.4.1 (x86_64)"]
[BlackACPL "669"]
[ECO "B10"]
[Opening "Caro-Kann Defense: Two Knights Attack"]
[WhiteACPL "4"]

{ Sjaak II 1.4.1 (x86_64) } 1. e4 c6 2. Nc3 d5 3. Nf3 { B10 Caro-Kann Defense: Two Knights Attack } 3... dxe4 4. Nxe4 Nf6 5. Qe2 Nbd7 $4 { 159.99 } ( 5... Nxe4 6. Qxe4 Qd5 7. Qxd5 cxd5 8. c4 e6 9. cxd5 exd5 10. d4 { 0.26/12 } ) 6. Nd6# 1-0

""")
f.close()
pgn = open("test.pgn")
game = chess.pgn.read_game(pgn)
board = game.board()
for node in game.mainline():
    #board.push(node.move) # work
    board.push(node.comment) # not work
board

error traceback

---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)
[<ipython-input-20-bf6c23090d2a>](https://localhost:8080/#) in <cell line: 18>()
     18 for node in game.mainline():
     19     #board.push(node.move)
---> 20     board.push(node.comment)
     21 board

1 frames
[/usr/local/lib/python3.10/dist-packages/chess/__init__.py](https://localhost:8080/#) in _to_chess960(self, move)
   3634 
   3635     def _to_chess960(self, move: Move) -> Move:
-> 3636         if move.from_square == E1 and self.kings & BB_E1:
   3637             if move.to_square == G1 and not self.rooks & BB_G1:
   3638                 return Move(E1, H1)

AttributeError: 'str' object has no attribute 'from_square'

[sugizo]

please ignore my first post,

what i want to achieve is to see the move in ( 5... Nxe4 6. Qxe4 Qd5 7. Qxd5 cxd5 8. c4 e6 9. cxd5 exd5 10. d4 { 0.26/12 } ) :

1. e4 c6 2. Nc3 d5 3. Nf3 { B10 Caro-Kann Defense: Two Knights Attack } 3... dxe4 4. Nxe4 Nf6 5. Qe2 Nbd7 $4 { 159.99 } ( 5... Nxe4 6. Qxe4 Qd5 7. Qxd5 cxd5 8. c4 e6 9. cxd5 exd5 10. d4 { 0.26/12 } )

so the game ended in the 20 ply,

question
how to achieve it using python chess ?

thanks and best regards