minecraft launcher.py

import urllib2
import subprocess

loginurl = "https://login.minecraft.net/?&user={0}&password={1}&version=9999"
user = "user"
pass_ = "pass"

loginurl = loginurl.format(user, pass_)
print "attempting login"
data = urllib2.urlopen(loginurl)
retn = data.read().strip("\r\n")

if ":" in retn:
    print "login ok"
    parts = retn.split(":")
    session = parts[3]
    user = parts[2]
    line = r'java -cp "C:\Documents and Settings\EntityReborn\Application Data\.minecraft\bin\*" ' + \
    r'-Djava.library.path="C:\Documents and Settings\EntityReborn\Application Data\.minecraft\bin\natives" ' + \
    r'net.minecraft.client.Minecraft "{0}" "{1}"'.format(user, session)
    subprocess.Popen(line)
else:
    print retn