Python print()/sys.stdout.write() not visible when using logging

Question

I'm using logging extensively in my program. But now I want to write to stdout without using the logging module, but the output does not show up.

Neither:

sys.stdout.write( "BOE!" )

Nor

print( "WAH!" )

is working. Can someone enlighten me?

Is this an application, you are running from console? I am new to python. However, if this is a windows based app, where will this get logged? — shahkalpesh
– shahkalpesh, Commented Jun 21, 2013 at 19:02
Well, that's the thing, in a minimal example it DOES work. So I'm just looking for people who have seen it before. The reason why I assume it's due to logging, is because I've seen it before myself, but only in applications that used logging + it occured only after I started using the logging module. — A.J.Rouvoet
– A.J.Rouvoet, Commented Jun 21, 2013 at 19:04
It really shouldn't be due to logging (provided that you use the default logging module). Make sure that you didn't change sys.stdout anywhere. — Johannes P
– Johannes P, Commented Jun 21, 2013 at 19:04
Yes it's a console application. In windows one would have to use a terminal emulator such as cygwin to use it. — A.J.Rouvoet
– A.J.Rouvoet, Commented Jun 21, 2013 at 19:05

Community · Accepted Answer · 2017-05-23 12:20:25Z

7

Its possible that your Python output is being buffered. Have a look at these two StackOverflow QAs:

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answered Jun 21, 2013 at 19:06

Suman

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3 Comments

I should have mentioned that I've already tried flushing the stream

Additionally I've tried to use stderr, which is unbuffered if I'm not mistaken

Whoo, something went wrong when I tested that. It actually did the trick. Thanks.