print the output in txt from command line using python

Question

I want to print the output from a python.py file into a txt so i use this code:

python program.py > output.txt

that goes on the command line.

The problem is : it only print the 90% of the outputs, it seems that the program is too long so anyway, is there a way to print all the output in the txt ? something like:

python program.py > output.txt 1000 lines

THATS THE CODE : http://pastebin.com/2bSiGKx8

THATS WHAT IT PRINTS : http://pastebin.com/r00JteMG

Your command syntax is correct. Are you sure that the python script is not just failing before it writes what you expect? — Klaus Byskov Pedersen, Jun 30 '13 at 21:09
@KlausByskovPedersen yes im sure in fact the compiler print everything, but when i use this command the txt only gets like 4800 lines the program have like 5000 — Carlos Waitforit Reichmann Val, Jun 30 '13 at 21:11

Ashwini Chaudhary · Answer 1 · 2013-06-30T21:24:29.777

1

Within the program you can re-direct sys.stdout to a file object:

import sys
orig_sys = sys.stdout
with open('output.txt','w') as out:
    sys.stdout = out
    #your code here
    print "foo"
    print "bar"

or pass the file name from command line arguments:

#run this as: python program.py output.txt
import sys
filename = sys.argv[1]
orig_sys = sys.stdout
with open(filename,'w') as out:
    sys.stdout = out
    #your code here

But python program.py > output.txt is also fine, may be there's something wrong with your code.

edited Jun 30 '13 at 21:24

answered Jun 30 '13 at 21:12

Ashwini Chaudhary

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i get some error i dont know what it is because the command line close automatically, does that work for python 2.7? =) – Carlos Waitforit Reichmann Val Jun 30 '13 at 21:17
@CarlosWaitforitReichmannVal works fine in both py2.x and py3.x . – Ashwini Chaudhary Jun 30 '13 at 21:20
nice i get this error " Value Error: I/O operation on closed file " , what can it be? i tried the first option you gave me =) thanks – Carlos Waitforit Reichmann Val Jun 30 '13 at 21:23
@CarlosWaitforitReichmannVal your code should be inside the `with` statement, not outside of it. Because `with` statement automatically closes the file when the `with` block is over. – Ashwini Chaudhary Jun 30 '13 at 21:23
thanks but when i put the code inside the with statement i and i run the program i get an infinite " RUNNING " or " LOADING " loop.. and the output.txt appear but empty – Carlos Waitforit Reichmann Val Jun 30 '13 at 21:34
@CarlosWaitforitReichmannVal This method and `python program.py > output.txt` both are fine. There's something wrong with your code. – Ashwini Chaudhary Jun 30 '13 at 21:37
Sorry Ashwini my problem. it works fine but the txt print only until some line.. maybe its a notepad length problem ? – Carlos Waitforit Reichmann Val Jun 30 '13 at 21:39
let us [continue this discussion in chat](http://chat.stackoverflow.com/rooms/32651/discussion-between-carlos-waitforit-reichmann-val-and-ashwini-chaudhary) – Carlos Waitforit Reichmann Val Jun 30 '13 at 21:39

score 0 · Answer 2 · edited May 23 '17 at 10:32

0

Probably the problem that you're running into is that program.py is printing things both to stdout (which works for going into output.txt using '>') and to stderr (which would not go into the output.txt file using '>', but would go into it if you used '2>' instead). See this question on answers to what you're trying to do: How can I redirect and append both stdout and stderr to a file with Bash?

edited May 23 '17 at 10:32

Community

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answered Jun 30 '13 at 21:12

crouleau

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when i use python LPIFINAL.py 2> output.txt i get the print in the command line and the .txt is created, but it is empty – Carlos Waitforit Reichmann Val Jun 30 '13 at 21:15
Read this: http://stackoverflow.com/questions/876239/bash-redirect-and-append-both-stdout-and-stderr – crouleau Jun 30 '13 at 21:16
i have tried the solucion to that post but i get the same only 4800 from 5000 lines. i used this command python LPIFINAL.py >> salida.txt 2>&1 – Carlos Waitforit Reichmann Val Jun 30 '13 at 21:26

Moh Zah · Answer 3 · 2013-07-01T00:01:18.057

0

try to flush output buffer

import sys
sys.stdout.flush()

If it didn't work, instead of using print you can try logging though I guess there is not much big difference!

import logging
logging.basicConfig(format='%(message)s', filename='example.log',level=logging.DEBUG)
logging.debug('what you want to right in your file')

edited Jul 01 '13 at 00:01

answered Jun 30 '13 at 21:57

Moh Zah

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i tried it and it doesnt work. THATS THE CODE : http://pastebin.com/2bSiGKx8 THATS WHAT IT PRINTS : http://pastebin.com/r00JteMG – Carlos Waitforit Reichmann Val Jun 30 '13 at 22:02
@CarlosWaitforitReichmannVal try logging – Moh Zah Jul 01 '13 at 00:01

print the output in txt from command line using python

3 Answers3