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import os
gsize = os.system('dir dir C:\Users\GNK\Documents')

Which will give out put as below. but i want to print only last 2 lines.

C:\Users\GNK>dir C:\Users\GNK\Documents
06/26/2017  04:24 PM            13,826 1.xlsx
07/03/2017  10:52 PM            15,068 2.xlsx
08/11/2017  05:59 PM         3,227,457 3.zip
08/14/2017  02:56 PM               527 4.sql
06/09/2017  02:36 PM             3,976 5.sql
06/09/2017  02:54 PM           601,580 6.zip
06/12/2017  07:59 PM       116,641,792 7.mp3
08/12/2017  09:25 AM        15,747,576 8.exe
06/16/2017  12:23 AM           286,829 9
08/19/2017  02:38 PM         1,211,008 10
07/21/2017  08:08 AM            98,776 11
08/03/2017  10:38 PM        10,427,892 11
06/04/2017  05:20 PM           196,126 12
05/21/2017  09:11 AM           196,126 13
06/04/2017  05:22 PM           232,964 14
05/21/2017  09:11 AM           232,964 15
07/07/2017  12:03 PM            13,077 16
07/07/2017  12:02 PM            13,076 v17t
07/06/2017  07:57 AM        49,400,720 18
05/23/2017  12:56 AM           551,522 19
             160 File(s)    921,950,736 bytes
               3 Dir(s)  21,563,650,048 bytes free

I want to print only last 2 lines. how can I do this. Please help

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1 Answer 1

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From the os.system doc you can read:

The subprocess module provides more powerful facilities for spawning new processes and retrieving their results; using that module is preferable to using this function. See the Replacing Older Functions with the subprocess Module section in the subprocess documentation for some helpful recipes.

So I think would be better for you do something like:

import subprocess
print(subprocess.check_output(['dir', 'C:\Users\GNK\Documents']).splitlines()[-2:])

The .splitlines()[-2:] part is to keep just the last two lines. You can join them to form a two line string if you want with:

str.join('\n', subprocess.check_output(['dir', 'C:\Users\GNK\Documents']).splitlines()[-2:])
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4 Comments

Thanks. I Tried that it was throwing an error. was not able to fix that. please find below that error Traceback (most recent call last): File "g_size.py", line 4, in <module> proc1 = subprocess.Popen('git.cmd dir') File "C:\Python27\lib\subprocess.py", line 390, in init errread, errwrite) File "C:\Python27\lib\subprocess.py", line 640, in _execute_child startupinfo) WindowsError: [Error 2] The system cannot find the file specified
@GNK From where you are running the script? I read in your error output 'git.cmd dir', pls try to run the script outside whatever git shell you have. The other thing to try is to add the shell=True parameter to the subprocess.check_output func.
Tried changing the function and ran outside the git cmd. still no luck. error as below. File "g_size.py", line 4, in <module> print(subprocess.check_output(['dir', 'C:\Users\gnk' 'shell=True']).splitlines()[-2:]) File "C:\Python27\lib\subprocess.py", line 212, in check_output process = Popen(stdout=PIPE, *popenargs, **kwargs) File "C:\Python27\lib\subprocess.py", line 390, in init errread, errwrite) File "C:\Python27\lib\subprocess.py", line 640, in _execute_child startupinfo) WindowsError: [Error 2] The system cannot find the file specified
print(subprocess.check_output(['dir', 'C:\Users\gnk' 'shell=True']) is not good ;) it should be like: print(subprocess.check_output(['dir', 'C:\Users\gnk'], shell=True). The shell=True is an extra parameter to the check_output func, not part of the first parameter (that is a list). I don't have a windows machine near of me now, that is whyI'm kind of blind here.

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