try to follow PEP8

- fixed most important code after checking with flake8
- ignored code which has to be reworked or removed
+ mark unused code with 'TODO: remove ...'

Change-Id: Ic45e541049e391e2853d29cd64bb0963bd9a2125
Reviewed-on: https://forge.frm2.tum.de/review/c/sine2020/secop/playground/+/25053
Tested-by: Jenkins Automated Tests <pedersen+jenkins@frm2.tum.de>
Reviewed-by: Enrico Faulhaber <enrico.faulhaber@frm2.tum.de>

secop/poller.py

@@ -167,8 +167,8 @@ class Poller(PollerBase):
                     continue  # only one poller per handler
                 handlers.add(pobj.handler)
             # placeholders 0 are used for due, lastdue and idx
-            self.queues[polltype].append((0, 0,
-                (0, module, pobj, pname, factors[polltype])))
+            self.queues[polltype].append(
+                (0, 0, (0, module, pobj, pname, factors[polltype])))
 
     def poll_next(self, polltype):
         """try to poll next item