try: frozenset except NameError: print("SKIP") import sys sys.exit() # Examples from https://docs.python.org/3/library/stdtypes.html#set # "Instances of set are compared to instances of frozenset based on their # members. For example:" print(set('abc') == frozenset('abc')) # This doesn't work in uPy #print(set('abc') in set([frozenset('abc')]))