Update Lib/pprint.py

Co-authored-by: donBarbos <donbarbos@proton.me>

Author: StefanTodoran

Lib/pprint.py

@@ -219,7 +219,7 @@ def _format(self, object, stream, indent, allowance, context, level):
 
     def _format_block_start(self, start_str, indent):
         if self._block_style:
-            return start_str +'\n' + ' ' * indent
+            return f"{start_str}\n{' ' * indent}"
         else:
             return start_str