formatting, comments

cheroot/makefile.py

@@ -36,7 +36,7 @@ def write(self, b):
             self._flush_unlocked()
             return len(b)
 
-    def _safe_call(self, is_reader, call, *args, **kwargs):  # noqa: C901
+    def _safe_call(self, is_reader, call, *args, **kwargs):
         """Call the supplied callable with retries, as needed.
 
         Method to be overridden in subclasses/mix-ins.
@@ -50,7 +50,7 @@ def _flush_unlocked(self):
                 # ssl sockets only except 'bytes', not bytearrays
                 # so perhaps we should conditionally wrap this for perf?
                 n = self._safe_call(
-                    False, self.raw.write, bytes(self._write_buf)
+                    False, self.raw.write, bytes(self._write_buf),
                 )
             except io.BlockingIOError as e:
                 n = e.characters_written

cheroot/ssl/pyopenssl.py

@@ -162,10 +162,13 @@ def sendall(self, *args, **kwargs):
         """Send whole message to the socket.
 
         Not supported due to https://github.com/pyca/pyopenssl/issues/176.
+        Until that bug is fixed, sendall() may throw SSL.WantWriteError, but
+        there is no correct way to retry the call because we don't know how
+        many bytes were already transmitted. We could work around this by
+        reimplementing sendall() using send(), but we don't actually use
+        sendall() anywhere.
         """
-        raise NotImplementedError(
-            'sendall() not supported on pyOpenSSL due to issue #176'
-        )
+        raise NotImplementedError('sendall() is unsupported by pyOpenSSL')
 
     def send(self, *args, **kwargs):
         """Send some part of message to the socket."""