SERVER_TO_CLIENT = 0x01
CLIENT_TO_SERVER = 0x02

structs = {
    #lots of packet structures in here
    }

#Normalize data structures
for key, val in structs.iteritems():
    if isinstance(val, dict):
        for k in (SERVER_TO_CLIENT, CLIENT_TO_SERVER):
            if len(val[k]) and not isinstance(val[k][0], tuple):
                structs[key][k] = (val[k],)
        continue
    elif len(val) and not isinstance(val[0], tuple):
        val = (val,)
    val = {
        CLIENT_TO_SERVER: val,
        SERVER_TO_CLIENT: val}
    structs[key] = val