fixed error handler syntax in SQLDatabase.to_sql

Author: arw2019

pandas/io/sql.py

@@ -1397,7 +1397,7 @@ def to_sql(
         try:
             table.insert(chunksize, method=method)
         except exc.SQLAlchemyError as err:
-            msg = '(1054, "Unknown column ' + "'inf' in 'field list'" + '")'
+            msg = "(1054, \"Unknown column 'inf' in 'field list'\")"
             errText = str(err.orig)
             if re.search(msg, errText):
                 raise ValueError("inf can not be used with MySQL") from err