1 files changed, 10 insertions, 7 deletions
diff --git a/synapse/util/patch_inline_callbacks.py b/synapse/util/patch_inline_callbacks.py
index 6d4b0b7c5a..dace68666c 100644
--- a/synapse/util/patch_inline_callbacks.py
+++ b/synapse/util/patch_inline_callbacks.py
@@ -217,13 +217,16 @@ def _check_yield_points(
                 # We don't raise here as its perfectly valid for contexts to
                 # change in a function, as long as it sets the correct context
                 # on resolving (which is checked separately).
-                err = "%s changed context from %s to %s, happened between lines %d and %d in %s" % (
-                    frame.f_code.co_name,
-                    expected_context,
-                    current_context(),
-                    last_yield_line_no,
-                    frame.f_lineno,
-                    frame.f_code.co_filename,
+                err = (
+                    "%s changed context from %s to %s, happened between lines %d and %d in %s"
+                    % (
+                        frame.f_code.co_name,
+                        expected_context,
+                        current_context(),
+                        last_yield_line_no,
+                        frame.f_lineno,
+                        frame.f_code.co_filename,
+                    )
                 )
                 changes.append(err)