diff --git a/dup_keys.py b/dup_keys.py
new file mode 100644
index 00000000..62e71a93
--- /dev/null
+++ b/dup_keys.py
@@ -0,0 +1,5 @@
+my_dict = {
+    "key_one": 1,
+    "key_two": 2,
+    "key_one": 3
+}