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-rw-r--r--lib/sqlalchemy/ext/automap.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/sqlalchemy/ext/automap.py b/lib/sqlalchemy/ext/automap.py
index 219bfe124..14599fe5e 100644
--- a/lib/sqlalchemy/ext/automap.py
+++ b/lib/sqlalchemy/ext/automap.py
@@ -906,7 +906,7 @@ def _relationships_for_fks(automap_base, map_config, table_to_map_config,
)
o2m_kws = {}
- nullable = False not in set([fk.parent.nullable for fk in fks])
+ nullable = False not in {fk.parent.nullable for fk in fks}
if not nullable:
o2m_kws['cascade'] = "all, delete-orphan"