import subprocess
subprocess.call('notepad')

import os

con = os.popen("ping 127.0.0.1","r")
while 1:
    line = con.readline()
    print line,
    if not line: break

import os
import platform
if platform.system() == "Windows":
    req = "sr.py pp"
else:
    req = "python sr.py pp"
con = os.popen(req,"r")
line = ""
while 1:
    s = con.readline()
    if not s:
        break
    else:
        line+=s
print line

line = ""
while 1:
    line+=s

line = []
while 1:
    line.append(s)
line = ''.join(line)