Interactive user input while using stdout

Question

in a script I use sys.stdout.write() to output processed data to stdout, which later I use on CLI to redirect stdout to file:

python.exe script.py > file.out

I could not write to file inside python script as redirected file can't be known

My problem is that I use also raw_input(), as I need user to pass certain number before processing starts, but prompt doesn't show as I redirect stdout - i.e. script waits for user input but does not show anything

Can someone give me a tip how to handle this?

TIA

Rumple Stiltskin · Accepted Answer · 2011-04-16 05:42:20Z

2

See if this works for you:

#!/usr/bin/python
import sys
import os
# Disable buffering for stdout
sys.stdout = os.fdopen(sys.stdout.fileno(), 'w', 0)
x = raw_input(">")
print x

Run this as:

python ./test.py | tee ./file.out

Now, you will see your output on console and it will be redirected to the file.out as well.

answered Apr 16, 2011 at 5:42

Rumple Stiltskin

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1 Comment

joaquin Over a year ago

you should add that in windows you must install the tee program.

Rafe Kettler · Accepted Answer · 2011-04-16 02:55:44Z

0

Take the filename as a command-line argument instead of redirecting stdout. That way, you can print output or use raw_input() as normal. Example:

import sys

outfile = open(sys.argv[1], 'w')
# write to the outfile
x = raw_input("What's your name?")
outfile.write(x)

Usage:

python myscript.py file.out

This will work on any platform.

answered Apr 16, 2011 at 2:55

Rafe Kettler

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3 Comments

Vladan Over a year ago

I want to print to stdout by default. I can check if there is argument after the script, and if there isn't then write to stdout instead to file, but I was seeking for a way without writing to file from this script if possible. Thanks

Rafe Kettler Over a year ago

@Ghostly why? What's wrong with writing to a file (especially stdout)? That's no different from a plain print.

Vladan Over a year ago

OK, maybe you are right. I have couple of interacting scripts, and defaulting to stdout was desired in this examples. I'll check if there is argument - if so write to file, and if not I'll use stdout. Thanks

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