def iterkeys(obj):
    "Get key iterator from dictionary for Python 2 and 3"
    return iter(obj.keys()) if sys.version_info.major == 3 else obj.iterkeys()
def iterkeys ( obj ) : return iter ( obj . keys ( ) ) if sys . version_info . major == 3 else obj . iterkeys ( )
Get key iterator from dictionary for Python 2 and 3