Shell Programming and Scripting

$ sed '/import/ s/,/\nimport/g' file

$ awk -F"," '/^import/{print $1;for (i=2;i<=NF;i++) print "import"$i;next}1' input.py

$ awk '!/import/{$0 = "import"$0}1' RS=",|\n" file

file = "input.py"
subprocess.Popen(["sed", "/import/ s/,/\nimport/g", file])

[akshay@aix tmp]$ cat f
import gtk, pango, gtksourceview2, gobject
import sys, os, re, glob, subprocess, webbrowser, base64, cgi, urllib2, shutil, time, pgsc_spellcheck

[akshay@aix tmp]$ cat test.py
#!/usr/bin/env python
from subprocess import Popen, PIPE
args = ["awk '!/import/{$0 = \"import\"$0}1' RS=',|\n' f"]
p = Popen(args,shell=True, stdout=PIPE, stderr=PIPE)
out, err = p.communicate()
print "return: ", p.returncode
print out.rstrip(), err.rstrip()

[akshay@aix tmp]$ ./test.py 
return:  0
import gtk
import pango
import gtksourceview2
import gobject
import sys
import os
import re
import glob
import subprocess
import webbrowser
import base64
import cgi
import urllib2
import shutil
import time
import pgsc_spellcheck