Demonstrating popen and popen2. : os « Buildin Module « Python Tutorial

1. Python Tutorial
2. Buildin Module
3. os

import os

if os.name == "nt" or os.name == "dos":  
   fileList = "dir /B"
   sortReverse = "sort /R"
elif os.name == "posix":  # UNIX-compatible system
   fileList = "ls -1"
   sortReverse = "sort -r"
else:
   sys.exit( "OS not supported by this program." )

dirOut = os.popen( fileList, "r" )
sortIn, sortOut = os.popen2( sortReverse )

filenames = dirOut.read()  

print "(Output from '%s'):" % fileList
print filenames

sortIn.write( filenames )  

dirOut.close()
sortIn.close()

print "(Output from '%s'):" % sortReverse
print sortOut.read() 

sortOut.close()