diff options
Diffstat (limited to 'lib/sqlalchemy/util/langhelpers.py')
| -rw-r--r-- | lib/sqlalchemy/util/langhelpers.py | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/lib/sqlalchemy/util/langhelpers.py b/lib/sqlalchemy/util/langhelpers.py index dd2589243..743afccfd 100644 --- a/lib/sqlalchemy/util/langhelpers.py +++ b/lib/sqlalchemy/util/langhelpers.py @@ -1019,7 +1019,9 @@ def constructor_copy(obj, cls, *args, **kw): """ names = get_cls_kwargs(cls) - kw.update((k, obj.__dict__[k]) for k in names if k in obj.__dict__) + kw.update( + (k, obj.__dict__[k]) for k in names.difference(kw) + if k in obj.__dict__) return cls(*args, **kw) |