1 files changed, 4 insertions, 0 deletions
diff --git a/Lib/sets.py b/Lib/sets.py
index 32a0dd6..99ee931 100644
--- a/Lib/sets.py
+++ b/Lib/sets.py
@@ -80,6 +80,10 @@ except ImportError:
 
 __all__ = ['BaseSet', 'Set', 'ImmutableSet']
 
+import warnings
+warnings.warn("the sets module is deprecated", DeprecationWarning,
+                stacklevel=2)
+
 class BaseSet(object):
     """Common base class for mutable and immutable sets."""