Quick script to query the MA RMVs for their wait times every 60 seconds. I ended up using this to find the optimum time to go visit the RMV since I didn't want to wait long...

ma_rmv_wait_times.py

# -----------------------------------------------------------------------------
# Modifiable parameters
# -----------------------------------------------------------------------------

# Where to save the results to
save_file = "times.txt"

# The branch locations you care about
locations = ["Boston", "Watertown", "Natick", "Roslindale"]

# -----------------------------------------------------------------------------
# Some constants that probably don't need to be changed
# -----------------------------------------------------------------------------

# The hours that the RMVs are open (9-6) (usually 9-5, but some days are 10-6)
OPENING_HOURS = [9, 18]

# The URL to get the wait times
QUERY_URL = "https://www.massrmv.com/DesktopModules/BranchMapDNN/GetWaitTimes.aspx"

# The number of seconds to wait between successive queries
QUERY_INTERVAL = 60

# -----------------------------------------------------------------------------
# Don't change anything below here... unless you want to change the behavior
# -----------------------------------------------------------------------------

from datetime import date
from datetime import datetime
from datetime import time as dtime
import json
import re
import requests
from requests.exceptions import ConnectionError
import time


def parse_time(x):
    """Parse the time returned by the RMV call

    :param x: The time string as returned by the web call.
              E.g. "1 hour, 2 minutes, 54 seconds"
    :return: A string of the form "HH:MM:SS"
    """
    if x == u"No wait time":
        return u"00:00:00"
    if x == u"Closed":
        return None
    t = []
    for part in ["hour", "minute", "second"]:
        m = re.search(u"(\d+) {}".format(part), x)
        if m:
            t.append(u"{num:02d}".format(num=int(m.group(1))))
        else:
            t.append(u"00")
    return u":".join(t)


# Convert the hours to actual datetimes
for i in range(len(OPENING_HOURS)):
    OPENING_HOURS[i] = datetime.combine(date.today(), dtime(OPENING_HOURS[i]))

# Check to make sure that the RMV is actually open
if datetime.now() < OPENING_HOURS[0]:
    print "RMVs aren't open yet."
if datetime.now() > OPENING_HOURS[1]:
    print "RMVs are closed for the day."

# Keep querying for data while the RMV is open
while datetime.now() > OPENING_HOURS[0] and datetime.now() < OPENING_HOURS[1]:
    try:
        times = {}
        for location in locations:
            rv = requests.get("{}?Town={}".format(QUERY_URL, location))
            cur_times = [parse_time(x) for x in rv.text.split(u"|")[:2]]
            times[location] = {
                'licensing': cur_times[0],
                'registration': cur_times[1]
            }
        with open(save_file, "a") as f:
            f.write(u"{}\t{}\n".format(datetime.now(), json.dumps(times)))
        time.sleep(QUERY_INTERVAL)
    except ConnectionError:
        time.sleep(5)