Removed unused variables that are overwritten.

django/db/backends/mysql/creation.py

@@ -25,7 +25,7 @@ class DatabaseCreation(BaseDatabaseCreation):
         with self._nodb_connection.cursor() as cursor:
             try:
                 cursor.execute("CREATE DATABASE %s" % qn(target_database_name))
-            except Exception as e:
+            except Exception:
                 if keepdb:
                     return
                 try:

django/db/backends/postgresql/creation.py

@@ -41,7 +41,7 @@ class DatabaseCreation(BaseDatabaseCreation):
         with self._nodb_connection.cursor() as cursor:
             try:
                 cursor.execute(creation_sql)
-            except Exception as e:
+            except Exception:
                 if keepdb:
                     return
                 try:

django/db/models/sql/compiler.py

@@ -823,7 +823,6 @@ class SQLCompiler:
         """
         Returns an iterator over the results from executing this query.
         """
-        converters = None
         if results is None:
             results = self.execute_sql(MULTI)
         fields = [s[0] for s in self.select[0:self.col_count]]