Python frozenset examples

Python-3/basic_examples/python_frozenset_examples.py

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+fs = frozenset()
+print(fs)
+print(type(fs))
+
+# frozenset from iterable
+list_vowels = ['A', 'E', 'I', 'O', 'U']
+fs = frozenset(list_vowels)
+print(fs)
+
+tuple_numbers = (1, 2, 3, 4, 5, 4, 3)
+fs = frozenset(tuple_numbers)
+print(fs)
+
+# frozenset iteration
+fs = frozenset([1, 2, 3, 4, 5, 4, 3])
+for x in fs:
+    print(x)
+
+# frozenset functions
+# since frozen set is immutable, add(), remove(), update(), pop() etc. functions are not defined
+fs = frozenset([1, 2, 3, 4, 5])
+size = len(fs)
+print('frozenset size =', size)
+
+contains_item = 5 in fs
+print('fs contains 5 =', contains_item)
+
+not_contains_item = 6 not in fs
+print('fs not contains 6 =', not_contains_item)
+
+is_disjoint = fs.isdisjoint(frozenset([1, 2]))
+print(is_disjoint)
+
+is_disjoint = fs.isdisjoint(frozenset([10, 20]))
+print(is_disjoint)
+
+is_subset = fs.issubset(set([1, 2]))
+print(is_subset)
+
+is_subset = fs.issubset(set([1, 2, 3, 4, 5, 6, 7]))
+print(is_subset)
+
+is_superset = fs.issuperset(frozenset([1, 2]))
+print(is_superset)
+
+is_superset = fs.issuperset(frozenset([1, 2, 10]))
+print(is_superset)
+
+fs1 = fs.union(frozenset([1, 2, 10]), set([99, 98]))
+print(fs1)
+
+fs1 = fs.intersection(set((1, 2, 10, 20)))
+print(fs1)
+
+fs1 = fs.difference(frozenset([1, 2, 3]))
+print(fs1)
+
+fs1 = fs.symmetric_difference(frozenset([1, 2, 10, 20]))
+print(fs1)
+
+fs1 = fs.copy()
+print(fs1)
+
+# python frozenset to list, tuple
+fs = frozenset([1, 2, 3, 4, 5])
+l1 = list(fs)
+print(l1)
+
+t1 = tuple(fs)
+print(t1)