diff --git a/pythonProject/数据类型/集合/8.py b/pythonProject/数据类型/集合/8.py
new file mode 100644
index 0000000..1a35af3
--- /dev/null
+++ b/pythonProject/数据类型/集合/8.py
@@ -0,0 +1,5 @@
+A = {1, 2}
+B = {1, 2, 3, 4}
+print(A.issubset(B))   # A是B的子集
+print(B.issuperset(A)) # B是A的超级
+print(A.isdisjoint(B)) # A 和 B 有交集；若无交集则返回 True
\ No newline at end of file
diff --git a/pythonProject/数据类型/集合/9.py b/pythonProject/数据类型/集合/9.py
new file mode 100644
index 0000000..a81849b
--- /dev/null
+++ b/pythonProject/数据类型/集合/9.py
@@ -0,0 +1,5 @@
+# 如果你需要一个不可变的集合（例如作为字典的键），可以使用 frozenset
+fs = frozenset([1,2,3,4,5,6])
+B = {1, 2, 3, 4}
+print(fs)
+print(len(fs))