diff --git a/src/pip/_internal/exceptions.py b/src/pip/_internal/exceptions.py
index 9d97ea87c01..a3bb0eb1546 100644
--- a/src/pip/_internal/exceptions.py
+++ b/src/pip/_internal/exceptions.py
@@ -805,4 +805,7 @@ def __init__(
 
     def __str__(self) -> str:
         nice_available = " ".join(f'"{e}", ' for e in self.available_extras)[:-2]
-        return f"{self.base} {self.version} does not provide the extra '{self.extra}'\n{self.base} provides extras: {nice_available}"
+        return (
+            f"{self.base} {self.version} does not provide the extra '{self.extra}'"
+            f"\n{self.base} provides extras: {nice_available}"
+        )