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py-lightstreamer doesn't work with Python 3.x and requires patching.
I am preparing a patch that should address this (as well as keeping Python 2.x compatibility).
I will file a pull request, but in the meantime I prefer tracking the issue here.

Full disclosure: I work for Weswit (Lightstreamer).

Hello,

you might add continuous integration (with Travis CI for example)
it will help to ensure that it is working fine both with Python 2 and Python 3.

Kind regards

I've tried out the Lightstreamer python demo script, but since it only supports paid editions of the Lightstreamer server, I'm having a go with py-lightstreamer instead.

After modifying your barebones example to work with your current script (replacing client.on_connection_state() with client.on_state.listen() and table.on_update() with table.on_update.listen()) and substituting the parameters from the Basic Stock-List demo, I end up with this:

import lightstreamer

def on_connection_state(state):
    print 'CONNECTION STATE:', state
    if state == lightstreamer.STATE_DISCONNECTED:
        connect()

def on_update(item_id, row):
    print 'UPDATE!', row

def connect():
    client.create_session(username='', adapter_set='DEMO')
    table = lightstreamer.Table(client, item_ids='item1|item2', schema='stock_name|last_price',
        mode=lightstreamer.MODE_MERGE, data_adapter="MONITOR")
    table.on_update.listen(on_update)

client = lightstreamer.LsClient('http://push.lightstreamer.com/')
client.on_state.listen(on_connection_state)

connect()
raw_input('Press CR to exit')
client.destroy()
client.join()

However, upon running this in Python 2.7, the connection state endlessly switches between connecting and disconnected. What am I doing wrong?

I suppose my real question should be: Will py-lightstreamer work with the Moderato edition of Lightstreamer, with its very limited selection of client APIs? I'm guessing the answer is probably going to be no.

Cheers,
Jon

When trying to create a session, the state will be "disconnected" immediately and after then an error follows: No handlers could be found for logger "lightstreamer"