clean up the globals to an initial state

cleanup_globals.py

dont_clean = [ 'initial_vars' ]

def cleanup():
    print dont_clean 
    vars_to_free = [ k for k in set( globals().copy() ).difference( initial_vars.union( set( dont_clean ) ) ) ]
    print vars_to_free,
    for c in vars_to_free:
        del globals()[ c ]
    print "cleaned"

initial_vars = set( globals().keys() )