General consistency fixes

Author: Gobot1234

src/betterproto/__init__.py

@@ -26,7 +26,7 @@
 from .casing import camel_case, safe_snake_case, snake_case
 from .grpc.grpclib_client import ServiceStub
 
-if not (sys.version_info.major == 3 and sys.version_info.minor >= 7):
+if sys.version_info < (3, 7):
     # Apply backport of datetime.fromisoformat from 3.7
     from backports.datetime_fromisoformat import MonkeyPatch
 
@@ -984,8 +984,8 @@ def which_one_of(message: Message, group_name: str) -> Tuple[str, Any]:
     """Return the name and value of a message's one-of field group."""
     field_name = message._group_current.get(group_name)
     if not field_name:
-        return ("", None)
-    return (field_name, getattr(message, field_name))
+        return "", None
+    return field_name, getattr(message, field_name)
 
 
 # Circular import workaround: google.protobuf depends on base classes defined above.

src/betterproto/grpc/util/async_channel.py

@@ -9,17 +9,13 @@ class ChannelClosed(Exception):
     An exception raised on an attempt to send through a closed channel
     """
 
-    pass
-
 
 class ChannelDone(Exception):
     """
     An exception raised on an attempt to send receive from a channel that is both closed
     and empty.
     """
 
-    pass
-
 
 class AsyncChannel(AsyncIterable[T]):
     """

src/betterproto/plugin/models.py

@@ -486,7 +486,7 @@ def get_field_string(self, indent: int = 4) -> str:
         name = f"{self.py_name}"
         annotations = f": {self.annotation}"
         betterproto_field_type = (
-            f"betterproto.map_field("
+            "betterproto.map_field("
             f"{self.proto_obj.number}, betterproto.{self.proto_k_type}, "
             f"betterproto.{self.proto_v_type})"
         )
@@ -634,10 +634,7 @@ def proto_name(self) -> str:
 
     @property
     def route(self) -> str:
-        return (
-            f"/{self.output_file.package}."
-            f"{self.parent.proto_name}/{self.proto_name}"
-        )
+        return f"/{self.output_file.package}.{self.parent.proto_name}/{self.proto_name}"
 
     @property
     def py_input_message(self) -> Union[None, MessageCompiler]: