Type error Unhashable type:set

Question

The below code has an error in function U=set(p.enum()) which a type error of unhashable type : \'set\' actually if you can see the class method enum am returning \'L\' whic

Answer 1

This error is raised because a set can only contain immutable types. Or sets are mutable. However there is the frozenset type :

In [4]: a, b = {1,2,3}, {2,3,4}

In [5]: set([a,b])
---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
 in ()
----> 1 set([a,b])

TypeError: unhashable type: 'set'

In [6]: a, b = frozenset({1,2,3}), frozenset({2,3,4})

In [7]: set([a,b])
Out[7]: {frozenset({1, 2, 3}), frozenset({2, 3, 4})}