@@ -79,4 +79,3 @@ def head_id(self):
         """Head of the submodule."""
         head = C.git_submodule_head_id(self._subm)
         return Oid(raw=bytes(ffi.buffer(head)[:]))
-
@@ -1,6 +1,6 @@
 [pycodestyle]
 exclude = .eggs,.git,.tox,build,dist,docs,venv*
-ignore =
+select = E4,E9,W1,W2,W3,W6
 
 [tox:tox]
 envlist = py35,py36,py37,py38,pypy3
 
@@ -69,7 +69,7 @@ def test_ssh_key(self):
 
     def test_ssh_agent(self):
         username = "git"
- 
+
         cred = KeypairFromAgent(username)
         assert (username, None, None, None) == cred.credential_tuple
 
 
@@ -114,15 +114,15 @@ def assertRaisesWithArg(self, exc_class, arg, func, *args, **kwargs):
         with pytest.raises(exc_class) as excinfo:
             func(*args, **kwargs)
         assert excinfo.value.args == (arg,)
-        
+
         # Explicitly clear the Exception Info. Citing https://docs.pytest.org/en/latest/reference.html#pytest-raises:
         #
-        # Clearing those references breaks a reference cycle 
-        # (ExceptionInfo –> caught exception –> frame stack raising the exception 
-        # –> current frame stack –> local variables –> ExceptionInfo) which makes 
-        # Python keep all objects referenced from that cycle (including all local 
-        # variables in the current frame) alive until the next cyclic garbage collection 
-        # run. See the official Python try statement documentation for more detailed 
+        # Clearing those references breaks a reference cycle
+        # (ExceptionInfo –> caught exception –> frame stack raising the exception
+        # –> current frame stack –> local variables –> ExceptionInfo) which makes
+        # Python keep all objects referenced from that cycle (including all local
+        # variables in the current frame) alive until the next cyclic garbage collection
+        # run. See the official Python try statement documentation for more detailed
         # information.
         del excinfo