1 files changed, 13 insertions, 10 deletions
diff --git a/lib/sqlalchemy/dialects/mysql/dml.py b/lib/sqlalchemy/dialects/mysql/dml.py
index 130ef2347..5d59b2073 100644
--- a/lib/sqlalchemy/dialects/mysql/dml.py
+++ b/lib/sqlalchemy/dialects/mysql/dml.py
@@ -6,7 +6,7 @@ from ...sql.base import _generative
 from ... import exc
 from ... import util
 
-__all__ = ('Insert', 'insert')
+__all__ = ("Insert", "insert")
 
 
 class Insert(StandardInsert):
@@ -39,7 +39,7 @@ class Insert(StandardInsert):
 
     @util.memoized_property
     def inserted_alias(self):
-        return alias(self.table, name='inserted')
+        return alias(self.table, name="inserted")
 
     @_generative
     def on_duplicate_key_update(self, *args, **kw):
@@ -87,27 +87,29 @@ class Insert(StandardInsert):
         """
         if args and kw:
             raise exc.ArgumentError(
-                "Can't pass kwargs and positional arguments simultaneously")
+                "Can't pass kwargs and positional arguments simultaneously"
+            )
 
         if args:
             if len(args) > 1:
                 raise exc.ArgumentError(
                     "Only a single dictionary or list of tuples "
-                    "is accepted positionally.")
+                    "is accepted positionally."
+                )
             values = args[0]
         else:
             values = kw
 
-        inserted_alias = getattr(self, 'inserted_alias', None)
+        inserted_alias = getattr(self, "inserted_alias", None)
         self._post_values_clause = OnDuplicateClause(inserted_alias, values)
         return self
 
 
-insert = public_factory(Insert, '.dialects.mysql.insert')
+insert = public_factory(Insert, ".dialects.mysql.insert")
 
 
 class OnDuplicateClause(ClauseElement):
-    __visit_name__ = 'on_duplicate_key_update'
+    __visit_name__ = "on_duplicate_key_update"
 
     _parameter_ordering = None
 
@@ -118,11 +120,12 @@ class OnDuplicateClause(ClauseElement):
         # Update._proces_colparams(), however we don't look for a special flag
         # in this case since we are not disambiguating from other use cases as
         # we are in Update.values().
-        if isinstance(update, list) and \
-                (update and isinstance(update[0], tuple)):
+        if isinstance(update, list) and (
+            update and isinstance(update[0], tuple)
+        ):
             self._parameter_ordering = [key for key, value in update]
             update = dict(update)
 
         if not update or not isinstance(update, dict):
-            raise ValueError('update parameter must be a non-empty dictionary')
+            raise ValueError("update parameter must be a non-empty dictionary")
         self.update = update