diff --git a/Top150Interview/217_Contains_Duplicate.py b/Top150Interview/217_Contains_Duplicate.py
index e69de29..2800c4c 100644
--- a/Top150Interview/217_Contains_Duplicate.py
+++ b/Top150Interview/217_Contains_Duplicate.py
@@ -0,0 +1,15 @@
+def containsDuplicate(nums):
+    """
+    :type nums: List[int]
+    :rtype: bool
+    """
+    dupes = []
+    for x in nums:
+        if x not in dupes:
+            dupes.append(x)
+        else:
+            return True
+    return False
+
+
+containsDuplicate([1,2,3,1])
\ No newline at end of file