Python - how can I read stdin from shell, and send stdout to shell and file

Question

I'd like to have a Python script read stdin from the shell (bash), and send stdout to shell as well a redirected file. I tried the following:

$ cat test.py #!/usr/bin/python val = raw_input("enter val: ") print val $ ./test.py | tee out testing enter val: testing $ cat out enter val: testing

For some reason, the raw_input prompt is printed after I type my input, which means I can't see the prompt as I type. With a bash script, I can get something similar to work.

$ cat test.sh #!/bin/bash echo "enter val: " read val echo $val $ ./test.sh | tee out enter val: testing testing $ cat out enter val: testing

tMC · Accepted Answer · 2011-06-02 18:51:46Z

#!/usr/bin/python import sys print "enter val: ", sys.stdout.flush() val = raw_input() print val

Or

#!/usr/bin/python import sys sys.stdout = sys.stderr val = raw_input("enter val: ") sys.stdout = sys.__stdout__ print val

dda · Accepted Answer · 2017-10-28 14:07:30Z

1

See this bug, looks like raw_input writes its prompt to stderr.

http://bugs.python.org/issue1927

edited Oct 28, 2017 at 14:07

dda

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answered Jun 2, 2011 at 18:50

rlawson

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2 Comments

senderle Over a year ago

I don't think this is the problem. I tried the same thing as the OP, but used print to output the prompt, and the result was the same.

rlawson Over a year ago

well it does it's just without the flush you see the same symptom - see tMCs answer

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