+1 I think this makes a lot of sense. What would you name the built in? -Joseph
On Feb 28, 2017, at 7:17 AM, Michel Desmoulin <desmoulinmichel@gmail.com> wrote:
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.
_______________________________________________ Python-ideas mailing list Python-ideas@python.org https://mail.python.org/mailman/listinfo/python-ideas Code of Conduct: http://python.org/psf/codeofconduct/