>>> set() in set()
False  # should raise TypeError

>>> dict() in set()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: unhashable type: 'dict'

>>> set() in dict()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: unhashable type: 'set'

>>> dict() in dict()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: unhashable type: 'dict'

>>> frozenset({1,2}) in {frozenset({1,2}), 3}
True

>>> {1,2} in {frozenset({1,2}), 3}
True  # should raise TypeError