examples: sms: resolve PEP8 issues

Use autopep8 utility to resolve issues like spaces before brackets
and wrong hanging indentation.

Also treat objects like boolean variables to check whether they are
None or not.

examples/sms-python/sms-python

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 # -*- Mode: python; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
 #
 # This program is free software; you can redistribute it and/or modify it under
@@ -25,7 +25,8 @@ gi.require_version('ModemManager', '1.0')
 from gi.repository import Gio, GLib, GObject, ModemManager
 
 
-if __name__ == "__main__":
+def main():
+    """Main routine."""
 
     # Process input arguments
     if len(sys.argv) != 3:
@@ -34,14 +35,15 @@ if __name__ == "__main__":
         sys.exit(1)
 
     # Prepare SMS properties
-    sms_properties = ModemManager.SmsProperties.new ()
+    sms_properties = ModemManager.SmsProperties.new()
     sms_properties.set_number(sys.argv[1])
     sms_properties.set_text(sys.argv[2])
 
     # Connection to ModemManager
-    connection = Gio.bus_get_sync (Gio.BusType.SYSTEM, None)
-    manager = ModemManager.Manager.new_sync (connection, Gio.DBusObjectManagerClientFlags.DO_NOT_AUTO_START, None)
-    if manager.get_name_owner() is None:
+    connection = Gio.bus_get_sync(Gio.BusType.SYSTEM, None)
+    manager = ModemManager.Manager.new_sync(
+        connection, Gio.DBusObjectManagerClientFlags.DO_NOT_AUTO_START, None)
+    if not manager.get_name_owner():
         sys.stderr.write('ModemManager not found in bus')
         sys.exit(2)
 
@@ -51,3 +53,7 @@ if __name__ == "__main__":
         sms = messaging.create_sync(sms_properties)
         sms.send_sync()
         print('%s: sms sent' % messaging.get_object_path())
+
+
+if __name__ == "__main__":
+    main()