$ cat fuk_javascript.py

#!/usr/bin/env python2

import gmail
import sys
import re

g = gmail.login(GMAIL_USERNAME, GMAIL_PASSWORD)

if not g.logged_in:
    sys.exit()

msgs = g.inbox().mail(unread=True, prefetch=True)

pattern = re.compile("javascript", flags=re.I)

for msg in msgs:
    if pattern.match(str(msg.body)):
        msg.move_to('[Gmail]/Spam')