Address feedback

Author: bryanforbes

asyncpg/cluster.py

@@ -126,7 +126,7 @@ def get_status(self) -> str:
             return self._test_connection(timeout=0)
         else:
             raise ClusterError(
-                'pg_ctl status exited with status {:d}: {}'.format(  # type: ignore[str-bytes-safe]  # noqa: E501
+                'pg_ctl status exited with status {:d}: {!r}'.format(
                     process.returncode, stderr))
 
     async def connect(self,
@@ -544,8 +544,9 @@ def _run_pg_config(self, pg_config_path: str) -> typing.Dict[str, str]:
         stdout, stderr = process.stdout, process.stderr
 
         if process.returncode != 0:
-            raise ClusterError('pg_config exited with status {:d}: {}'.format(  # type: ignore[str-bytes-safe]  # noqa: E501
-                process.returncode, stderr))
+            raise ClusterError(
+                'pg_config exited with status {:d}: {!r}'.format(
+                    process.returncode, stderr))
         else:
             config = {}
 
@@ -601,7 +602,7 @@ def _get_pg_version(self) -> 'types.ServerVersion':
 
         if process.returncode != 0:
             raise ClusterError(
-                'postgres --version exited with status {:d}: {}'.format(  # type: ignore[str-bytes-safe]  # noqa: E501
+                'postgres --version exited with status {:d}: {!r}'.format(
                     process.returncode, stderr))
 
         version_string = stdout.decode('utf-8').strip(' \n')