The difference in hits might be because MappingProxyType has a funny name and is in a hidden-ish location. I.e. not necessarily because it *would be* less used or useful if it were more exposed. In either case, the name that makes sense to me would be `frozendict`. That could very well live in `collections` of course. On Tue, Feb 28, 2017 at 7:40 AM, Ivan Levkivskyi <levkivskyi@gmail.com> wrote:
Searching MappingProxyType on GitHub gives over 10,000 results. I think it probably makes sense to make mappingproxy more "visible", maybe move it to collections module? (where OrderedDict lives)
I am not sure if it makes sense to move it to builtins. (for comparison frozenset gives around 1000,000 results)
-- Ivan
On 28 February 2017 at 16:24, Joseph Hackman <josephhackman@gmail.com> wrote:
+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.
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