bpo-44631: Make the repr() of the _Environ class more readable. (#27128)

Co-authored-by: Łukasz Langa <lukasz@langa.pl>

1 files changed, 5 insertions, 3 deletions

diff --git a/Lib/os.py b/Lib/os.py
index d26cfc9..8cc70a1 100644
--- a/Lib/os.py
+++ b/Lib/os.py
@@ -704,9 +704,11 @@ class _Environ(MutableMapping):
         return len(self._data)
 
     def __repr__(self):
-        return 'environ({{{}}})'.format(', '.join(
-            ('{!r}: {!r}'.format(self.decodekey(key), self.decodevalue(value))
-            for key, value in self._data.items())))
+        formatted_items = ", ".join(
+            f"{self.decodekey(key)!r}: {self.decodevalue(value)!r}"
+            for key, value in self._data.items()
+        )
+        return f"environ({{{formatted_items}}})"
 
     def copy(self):
         return dict(self)