How to save python screen output to a text file

Question

I m new to Python  I need to query items from a dict and save the result to a text file  Here s what I have   import json import exec fullog as e  input   e getdata    input now is a dict   which has items  keys and values    Query  print  Data collected on    input  header    timestamp   date   print   n CLASS 1 INFO n   for item in input  Demographics        if item  name   in   Carly    Jane            print item  name     Height    item  ht     Age    item  years    for item in input  Activity        if item  name   in   Cycle    Run    Swim           print item  name     Athlete    item  athl name     Age    item  years     How do I save the printed output to  a text file

User · Accepted Answer

Let me summarize all the answers and add some more.

To write to a file from within your script, user file I/O tools that are provided by Python (this is the f=open('file.txt', 'w') stuff.
If don't want to modify your program, you can use stream redirection (both on windows and on Unix-like systems). This is the python myscript > output.txt stuff.
If you want to see the output both on your screen and in a log file, and if you are on Unix, and you don't want to modify your program, you may use the tee command (windows version also exists, but I have never used it)
Even better way to send the desired output to screen, file, e-mail, twitter, whatever is to use the logging module. The learning curve here is the steepest among all the options, but in the long run it will pay for itself.

User · Answer

This is very simple   just make use of this example import sys with open  quot test txt quot    w   as sys stdout      print  quot hello quot

User · Answer

python script name py  gt  saveit txt   Because this scheme uses shell command lines to start Python programs  all the usual shell syntax applies  For instance  By this  we can route the printed output of a Python script to a file to save it

User · Answer

A quick and dirty hack to do this within the script is to direct the screen output to a file   import sys   stdoutOrigin sys stdout  sys stdout   open  log txt    w     and then reverting back to outputting to screen at the end of your code   sys stdout close   sys stdout stdoutOrigin   This should work for a simple code  but for a complex code there are other more formal ways of doing it such as using Python logging

User · Answer

You would probably want this  Simplest solution would be  Create file first   open file via  f   open   lt filename gt     w     or  f   open   lt filename gt     a     in case you want to append to file  Now  write to the same file via  f write  lt text to be written gt     Close the file after you are done using it    good pracitice f close

User · Answer

What you re asking for isn t impossible  but it s probably not what you actually want   Instead of trying to save the screen output to a file  just write the output to a file instead of to the screen   Like this   with open  outfile txt    w   as outfile      print  gt  gt outfile   Data collected on    input  header    timestamp   date     Just add that  gt  gt outfile into all your print statements  and make sure everything is indented under that with statement     More generally  it s better to use string formatting rather than magic print commas  which means you can use the write function instead  For example   outfile write  Data collected on      format input  header    timestamp   date       But if print is already doing what you want as far as formatting goes  you can stick with it for now     What if you ve got some Python script someone else wrote  or  worse  a compiled C program that you don t have the source to  and can t make this change  Then the answer is to wrap it in another script that captures its output  with the subprocess module  Again  you probably don t want that  but if you do   output   subprocess check output  sys executable     otherscript py    with open  outfile txt    wb   as outfile      outfile write output

User · Answer

Here s a really simple way in python 3    f   open  filename txt    w   print  something   file   f      found that from this answer  https   stackoverflow com a 4110906 6794367

User · Answer

We can simply pass the output of python inbuilt print function to a file after opening the file with the append option by using just two lines of code  with open  filename txt    a   as file      print   nThis printed data will store in a file   file file   Hope this may resolve the issue    Note  this code works with python3 however  python2 is not being supported currently

User · Answer

I found a quick way for this   log   open  log txt    a    def oprint message       print message      global log     log write message      return    code      log close     Whenever you want to print something just use oprint rather than print   Note1  In case you want to put the function oprint in a module then import it   use   import builtins  builtins log   open  log txt    a     Note2  what you pass to oprint should be a one string  so if you were using a comma in your print to separate multiple strings  you may replace it with

User · Answer

abarnert s answer is very good and pythonic  Another completely different route  not in python  is to let bash do this for you     python myscript py  gt  myoutput txt   This works in general to put all the output of a cli program  python  perl  php  java  binary  or whatever  into a file  see How to save entire output of bash script to file for more

[python] How to save python screen output to a text file

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