External command execution in Python

@ Shared server / Environment without pyenv or ʻanaconda`

ʻGoogling what corresponds to IPC :: Open3`. ↓

subprocess is recommended.

However,,,

↓

In the Python 2 series, the standard is not used, and it is clearly stated that subprocess32 can be used.

What's that? I wish I could replace it normally.

I don't have root privileges, so use pip to enter it locally.

Installation of subprocess32

Of course, the version of Python should be 2 series.

`python`


$ pip install --install-option="--prefix=$HOME/share" subprocess32
#$ export PYTHONPATH=$HOME/share/lib64/python2.6/site-packages:

So change the library call between 2 and 3

`python`


import sys
import platform
py_version = platform.python_version_tuple()[0]

if  py_version == 2:
    sys.path.append('/home/bunzaemon/share/lib64/python2.6/site-packages')
    from subprocess32 import Popen, PIPE
else:
    from subprocess   import Popen, PIPE

I think it's more like Python to use try, but ...

Popen

--String type in 2 series --Byte type in 3 series

return it. It cannot be handled properly unless it is changed to string [^ 2].

[^ 2]: The script doesn't pass unless decode ("utf-8 ") is output even though ʻutf-8is not output @Python2.6.6`

`python`


cmd  = 'ls -al'
p = Popen(cmd.split(), stdout=PIPE, stderr=PIPE)
out = ( p.communicate()[0].split("\n")            if py_version == 2 else
        p.communicate()[0].decode("utf-8").split("\n") )

for line in out:
    print (line)

Error in comunicate () [1].

You can use it like ʻIPC :: Open3normally, but for the time being, let's get used to the recommendedcomunicate`.

All sources

`python`


#!/usr/bin/env python
# -*- coding: utf-8 -*-
#Importing libraries
import sys
import platform

py_version = platform.python_version_tuple()[0]
if  py_version == 2:
    sys.path.append('/home/bunzaemon/share/lib64/python2.6/site-packages')
    from subprocess32 import Popen, PIPE
else:
    from subprocess   import Popen, PIPE

cmd  = 'ls -al'
p = Popen(cmd.split(), stdout=PIPE, stderr=PIPE)
out = ( p.communicate()[0].split("\n")            if py_version == 2 else
        p.communicate()[0].decode("utf-8").split("\n") )

for line in out:
    print (line)