Difference between tuples and frozensets in Python

Question

I\'m learning Python 3 using The Quick Python Book, where the author talks about frozensets, stating that since sets are mutable and hence unhashable, thereby becoming unfit

Answer 1

Volatility does mention that frozensets are not indexed. I was looking at the other functionality, so did not immediately realize that standard python slicing is not possible.

a = frozenset((1, 1, 1, 1, 2, 2, 2))  # results in frozenset([1, 2])
print a[0] 

will give error:

TypeError: 'frozenset' object does not support indexing

Obvious from fact that it is not indexed, but though it was worth adding explicitly here