DeprecationWarnings on compile

To reproduce, run python -W always -m compileall -f dbus/

Result:

[jayman@Jason-Desktop-Linux dbus-python]$ python -W always -m compileall -f dbus/
Listing 'dbus/'...
Compiling 'dbus/__init__.py'...
Compiling 'dbus/_compat.py'...
Compiling 'dbus/_dbus.py'...
Compiling 'dbus/_expat_introspect_parser.py'...
Compiling 'dbus/bus.py'...
Compiling 'dbus/connection.py'...
dbus/connection.py:337: DeprecationWarning: invalid escape sequence \ 
  """Arrange for the given function to be called when a signal matching
Compiling 'dbus/decorators.py'...
Compiling 'dbus/exceptions.py'...
Compiling 'dbus/gi_service.py'...
Compiling 'dbus/glib.py'...
Compiling 'dbus/gobject_service.py'...
Compiling 'dbus/lowlevel.py'...
Listing 'dbus/mainloop'...
Compiling 'dbus/mainloop/__init__.py'...
Compiling 'dbus/mainloop/glib.py'...
Compiling 'dbus/proxies.py'...
dbus/proxies.py:307: DeprecationWarning: invalid escape sequence \ 
  """Arrange for the given function to be called when the given signal
Compiling 'dbus/server.py'...
Compiling 'dbus/service.py'...
Compiling 'dbus/types.py'...
[jayman@Jason-Desktop-Linux dbus-python]$