diff options
Diffstat (limited to 'lib/sqlalchemy/event/attr.py')
| -rw-r--r-- | lib/sqlalchemy/event/attr.py | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/lib/sqlalchemy/event/attr.py b/lib/sqlalchemy/event/attr.py index 690ebce08..f0fff5ca4 100644 --- a/lib/sqlalchemy/event/attr.py +++ b/lib/sqlalchemy/event/attr.py @@ -62,10 +62,15 @@ class _DispatchDescriptor(RefCollection): self._empty_listeners = weakref.WeakKeyDictionary() def _adjust_fn_spec(self, fn, named): - argspec = util.get_callable_argspec(fn, no_self=True) if named: fn = self._wrap_fn_for_kw(fn) - fn = legacy._wrap_fn_for_legacy(self, fn, argspec) + if self.legacy_signatures: + try: + argspec = util.get_callable_argspec(fn, no_self=True) + except ValueError: + pass + else: + fn = legacy._wrap_fn_for_legacy(self, fn, argspec) return fn def _wrap_fn_for_kw(self, fn): |