Merge pull request #3481 from mrmundt/solver-bugfix

BUGFIX: f-string in contrib/solver

pyomo/contrib/solver/config.py

@@ -44,7 +44,7 @@ def TextIO_or_Logger(val):
             ans.append(LogStream(level=logging.INFO, logger=v))
         else:
             raise ValueError(
-                "Expected bool, TextIOBase, or Logger, but received {v.__class__}"
+                f"Expected bool, TextIOBase, or Logger, but received {v.__class__}"
             )
     return ans