Set added to help in removing duplicates. Change suggested by tscrim.

Co-authored-by: Travis Scrimshaw <[email protected]>

Author: Noel-Roemmele

src/sage/combinat/partition.py

@@ -7608,7 +7608,7 @@ def __classcall_private__(cls, n, parts):
             sage: list(Partitions(4,parts_in=vector(ZZ,[2,4])))
             [[4], [2, 2]]
         """
-        parts = tuple(sorted(map(ZZ,parts)))
+        parts = tuple(sorted(set(map(ZZ,parts))))
         return super().__classcall__(cls, Integer(n), parts)
 
     def __init__(self, n, parts):