Add a flake8 configuration

Not running it on CI or anything, just for developers who want to run it
locally.

examples/trio-server.py

@@ -86,10 +86,12 @@
 MAX_RECV = 2 ** 16
 TIMEOUT = 10
 
+
 ################################################################
 # I/O adapter: h11 <-> trio
 ################################################################
 
+
 # The core of this could be factored out to be usable for trio-based clients
 # too, as well as servers. But as a simplified pedagogical example we don't
 # attempt this here.

h11/_connection.py

@@ -32,6 +32,7 @@
 # - Apache: <8 KiB per line>
 DEFAULT_MAX_INCOMPLETE_EVENT_SIZE = 16 * 1024
 
+
 # RFC 7230's rules for connection lifecycles:
 # - If either side says they want to close the connection, then the connection
 #   must close.
@@ -501,7 +502,7 @@ def send_with_data_passthrough(self, event):
                 data_list = []
                 writer(event, data_list.append)
                 return data_list
-        except:
+        except BaseException:
             self._process_error(self.our_role)
             raise
 

h11/tests/test_events.py

@@ -161,7 +161,7 @@ def test_intenum_status_code():
 
     r = Response(status_code=HTTPStatus.OK, headers=[], http_version="1.0")
     assert r.status_code == HTTPStatus.OK
-    assert type(r.status_code) is not type(HTTPStatus.OK)
+    assert type(r.status_code) is not type(HTTPStatus.OK)  # noqa: F721
     assert type(r.status_code) is int
 
 

setup.cfg

@@ -11,3 +11,13 @@ line_length=88
 multi_line_output=3
 no_lines_before=LOCALFOLDER
 order_by_type=False
+
+[flake8]
+max-line-length = 88
+extend-ignore =
+    # 'from .foo import *' used; unable to detect undefined names
+    F403
+    # 'Foo' may be undefined, or defined from star import: foo
+    F405
+    # whitespace before ':'
+    E203