I'm trying to study the python library Telepot by looking at the counter.py example available here: https://github.com/nickoala/telepot/blob/master/examples/chat/counter.py.
I'm finding a little bit difficult to understand how the DelegatorBot class actually works.

This is what I think I've understood so far:

1.

I see that initially this class (derived from "ChatHandler" class) is being defined:

class MessageCounter(telepot.helper.ChatHandler):

    def __init__(self, *args, **kwargs):
        super(MessageCounter, self).__init__(*args, **kwargs)
        self._count = 0

    def on_chat_message(self, msg):
        self._count += 1
        self.sender.sendMessage(self._count)

2.

Then a bot is created by instancing the class DelegatorBot:

bot = telepot.DelegatorBot(TOKEN, [
    pave_event_space()(
        per_chat_id(), create_open, MessageCounter, timeout=10
    ),
])

3.

I understand that a new instance of DelegatorBot is created and put in the variable bot. The first parameter is the token needed by telegram to authenticate this bot, the second parameter is a list that contains something I don't understand.

I mean this part:

pave_event_space()(
    per_chat_id(), create_open, MessageCounter, timeout=10
)

And then my question is..

Is pave_event_space() a method called that returns a reference to another method? And then this returned method is invoked with the parameters (per_chat_id(), create_open, MessageCounter, timeout=10) ?