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-rw-r--r--lib/sqlalchemy/sql/coercions.py11
1 files changed, 6 insertions, 5 deletions
diff --git a/lib/sqlalchemy/sql/coercions.py b/lib/sqlalchemy/sql/coercions.py
index e21f4a9a5..dce329352 100644
--- a/lib/sqlalchemy/sql/coercions.py
+++ b/lib/sqlalchemy/sql/coercions.py
@@ -97,11 +97,12 @@ def _document_text_coercion(paramname, meth_rst, param_rst):
def _expression_collection_was_a_list(attrname, fnname, args):
if args and isinstance(args[0], (list, set, dict)) and len(args) == 1:
- util.warn_deprecated_20(
- 'The "%s" argument to %s() is now passed as a series of '
- "positional "
- "elements, rather than as a list. " % (attrname, fnname)
- )
+ if isinstance(args[0], list):
+ util.warn_deprecated_20(
+ 'The "%s" argument to %s(), when referring to a sequence '
+ "of items, is now passed as a series of positional "
+ "elements, rather than as a list. " % (attrname, fnname)
+ )
return args[0]
else:
return args