gawd I love python's sh module

watch_ovsdb.py

import sh
import errno
import time
import json

table_json = json.loads(str(sh.ovsdb_client("--format", "json", "list-tables")))
monitor_dict = dict()
for t in table_json['data']:
    monitor_dict[t[0]] = sh.ovsdb_client("--format", "json", "monitor", t[0], _piped=True, _iter_noblock=True)

while True:
    for table in monitor_dict.keys():
        line = monitor_dict[table].next()
        if line == errno.EWOULDBLOCK:
            print("Would Block, But NOT!")
        else:
            print "{}: {}".format(table, line)
    time.sleep(1)