chapter 8: Cannot receive GTP response from bot

[Sarah112358]

On windows, self.gtp_stream.stdout.readline() will loop infinitely when an empty line is returned by the bot (e.g. gnugo).

[macfergus]

Hi @Sarah112358, thank you for reporting this. I found the solution is to set bufsize=0 on the call to Popen. See this diff for a fix: 6afbe8c

[wang869]

can you teach me how to install Gnugo on windows?

[xhw98]

i also want to know how to init gnugo to play with the agnent in the book chapter 8?

[maxpumperla]

@wang869 @xhw98 all I can do is point you to the official documentation, which tells you how to do that: https://www.gnu.org/software/gnugo/gnugo_2.html#SEC13

[y-kkky]

@Sarah112358 @maxpumperla

for python3.7 smth changed in streams API.
To make it work you need to do:

1. To not be stuck forever on stdout.readline(), you need to subprocess.Popen add argument bufsize=0 like this:
   self.gtp_stream = subprocess.Popen( cmd, stdin=pipe, stdout=pipe, bufsize=0 )
2. After that, another issue raises: stdout.readline() now returns bytes literal instead of the string, so check line[0] == '=' will never be true. just add .decode() for bytes string like this:
   line = self.gtp_stream.stdout.readline().decode()

[y-kkky]

nice, didn't notice that @macfergus already added diff 👍
BTW I'm on the latest master, it is strange that I still have old code