if filename == '-':
if sys.platform == 'win32':
import msvcrt
- msvcrt.setmode(sys.stdout.fileno(), os.O_BINARY)
+ # stdout may be any IO stream. Eg, when using contextlib.redirect_stdout
+ with contextlib.suppress(io.UnsupportedOperation):
+ msvcrt.setmode(sys.stdout.fileno(), os.O_BINARY)
return (sys.stdout.buffer if hasattr(sys.stdout, 'buffer') else sys.stdout, filename)
for attempt in range(2):