We have the immutable frozenset for sets and and tuples for lists.
But we also have something to manipulate dict as immutable datastructures:
>>> from types import MappingProxyType as idict
>>> d = idict({'a':1, 'b':2, 'c':3})
>>> d['a'] = 4
Traceback (most recent call last):
File "<ipython-input-3-c6f93d6278af>", line 1, in <module>
d['a'] = 4
TypeError: 'mappingproxy' object does not support item assignment
We could expose this as a built type to allow the last of the most
important data structure in Python to be easily immutable.
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