Mainloops Role, DBus Event Loops

Question

This is a standard example of a DBus service.

import dbus
import gobject
from dbus import service
# from gi._gobject import MainLoop
from dbus.mainloop.glib import DBusGMainLoop

class DBusServer(service.Object):
    def __init__(self, name, object_path):
        # super(service.Object, self).__init__(name, object_path)
        dbus.service.Object.__init__(self, name, object_path)

    @dbus.service.method("com.test", in_signature='s', out_signature="s")
    def test(self, args):
        return args + " Sent by dbus client"

    @dbus.service.method("com.test", in_signature='s', out_signature="s")
    def foo(self, args):
        return "foo"

bus_loop = DBusGMainLoop(set_as_default=True)
session_bus = dbus.SessionBus()
session_name = service.BusName("com.test", session_bus)
dbus_server = DBusServer(session_name, "/test")

loop = gobject.MainLoop()

try:
    loop.run()
except KeyboardInterrupt:
    loop.quit()

I have questions regarding the two mainloops used here
1. What is the role of each mainloop or event loop in this code (if I use the correct terminology. Both of them are event loops that I assume)
2. If my application is not a GUI, why should I use gobject mainloop or qt mainloop, since it is necessary to detect user-generated events from the X11 library (in the case of Linux)
3. Why can't I use an infinite loop that does nothing instead of the main gobject loop (as follows)

while True:
    pass

Answer 1

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loop = gobject.MainLoop()
loop.run()

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