[Python-ideas] Immutable dictionaries

David Mertz mertz at gnosis.cx
Wed Nov 29 12:42:09 EST 2017


Also: https://pypi.python.org/pypi/frozendict

On Wed, Nov 29, 2017 at 9:30 AM, Asen Bozhilov <asen.bozhilov at gmail.com>

> This is my first post here. I have strong experience with JavaScript and
> I'm lucky that I could move forward to Python.
> What I miss in Python are immutable dictionaries. They are especially
> useful for configurations and call functions which expect dictionary as
> argument.  In my opinion they would let a place for underlying
> optimizations.
> I'd like to propose also literaling syntax for immutable dictionaries.
> immutable_dict = (
>     'key1' : 'value1',
>     'key2' : 'value2'
> )
> This syntax is not ambiguous with expression statements and tuple
> literals, but it requires a bit lookahed during the parsing.
> I would appreciate your opinions on the topic. Most interesting for me is
> why they are not already part of the language?
> Kind regards,
> Asen Bozhilov
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