Python output redirecting

Question

When I'm running python3 interpreter on Linux machine and trying to redirect it's stdout to file like this, nothing happens:

user@workmachine:~$ python3 > python.txt
Python 3.5.2 (default, Nov 23 2017, 16:37:01) 
[GCC 5.4.0 20160609] on linux
Type "help", "copyright", "credits" or "license" for more information.
\>>>

File python.txt remains empty while interpreter is running as well as after it was closed. All it's output is still in terminal.

On the other hand, if I'm redirecting R interpreter the same way ( R > R.txt ) the result is as expected ( all output redirected to file, see nothing in terminal ).

What's the difference? Are python writes all it's output to another stream than stdout, or what?

Possible duplicate of Redirect stdout to a file in Python?, Redirect stderr and stdout in Bash, etc. — jww
– jww, Commented Sep 10, 2018 at 13:11
@jww, the question you mention is about noninteractive mode. Please read the comment of my answer — Romeo Ninov
– Romeo Ninov, Commented Sep 10, 2018 at 13:15

Romeo Ninov · Accepted Answer · 2018-09-10 13:01:57Z

2

For your case seems python send information to STDERR and not to STDOUT. So you should use redirect like:

user@workmachine:~$ python3 2> python.txt

answered Sep 10, 2018 at 13:01

Romeo Ninov

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1 Comment

John Kugelman Over a year ago

It's common for interactive programs to write to stderr instead of stdout. For example, read -p "Type something: " will display its prompt on stderr.

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