Installer script for virtual box in ubuntu 14.04, 14.10, 12.04

install_virtual_box.py

#!/usr/bin/env python
import subprocess
import optparse
import platform

install = []
uninstall = ["sudo apt-get purge virtualbox*"]
PLATFORM = platform.system()
DIST_VERSION = platform.dist()[1]
ARCHITECTURE = platform.architecture()[0]

#-------------------------------------Running commands------------------------------------------------------------
def run_commands(cmds):
	for cmd in cmds:
		try:
			subprocess.call(cmd, shell=True)
		except Exception as e:
			print e

#--------------------------------Function to control option parsing in Python------------------------------------
def controller():
    global VERBOSE, install, uninstall
    #Create instance of OptionParser Module, included in Standard Library
    p = optparse.OptionParser(description='For installing Virtual Box',
                                            prog='install-virtual-box',
                                            version='install-virtual-box 0.1',
                                            usage= '%prog [option]')
    p.add_option('--install','-i', action="store_true", help='installs virtual box')
    p.add_option('--uninstall', '-u', action="store_true", help='uninstalls virtual box')
    p.add_option('--Version', '-V', help='specifying version')
    p.add_option('--verbose', '-v',
                action = 'store_true',
                help='prints verbosely',
                default=False)

    #Option Handling passes correct parameter to runBash
    options, arguments = p.parse_args()
    if options.verbose:
        VERBOSE=True
    if options.install:
    	#----------------------------------------setting commands---------------------------------------------
		#change to /tmp
		install.append("cd /tmp")

		#download the application
		if PLATFORM == "Linux":
			#Adding apt-key
			if DIST_VERSION == "14.10":
			    install.append('echo "deb http://download.virtualbox.org/virtualbox/debian utopic contrib" | sudo tee /etc/apt/sources.list > /dev/null')
			elif DIST_VERSION == "14.04":
			    install.append('echo "deb http://download.virtualbox.org/virtualbox/debian trusty contrib" | sudo tee /etc/apt/sources.list > /dev/null')
			elif DIST_VERSION == "12.04":
			    install.append('echo "deb http://download.virtualbox.org/virtualbox/debian precise contrib" | sudo tee /etc/apt/sources.list > /dev/null')

			install.append("wget -q http://download.virtualbox.org/virtualbox/debian/oracle_vbox.asc -O- | sudo apt-key add -")
			install.append("sudo apt-get update")

			##For 4.3
			if not options.Version:
				install.append("sudo apt-get install virtualbox-4.3")
			#Or which specified
			else:
				install.append("sudo apt-get install virtualbox-"+options.Version)

			#Istalling dkms
			install.append("sudo apt-get install dkms")
		else:
			print "Wrong operating system detected."

		value = run_commands(install)

    elif options.uninstall:
        value = run_commands(uninstall)
    else:
        p.print_help()

#Runs all the functions
def main():
    controller()

#This idiom means the below code only runs when executed from command line
if __name__ == '__main__':
    main()