Re: YAML 2.0: drop arbitrary nodes to be used as keys

On Wed, Mar 2, 2016 at 8:23 PM, Andrey Somov <[email protected]> wrote:
> Hi all,
> even though it looks like a powerful feature, it gives nothing.
>
> This should be removed:
> Note that YAML allows arbitrary nodes to be used as keys. In particular, a
> key may be a sequence or a mapping. Thus, without the above restrictions,
> practical one-pass parsing would have been impossible to implement.
>
> The reason is not that it makes it impossible to convert YAML to JSON.
> The reason is that it must never be used. YAML should not advocate
> collections (often mutable data structures) as keys.
> Of course, the related restrictions, like "1024 rule" or  "key is restricted
> to a single line", are also gone.
> The key must be a scalar. Point. Whatever it is.
>

No. Tuples are immutables in Python, and can be used as keys in Python
dictionaries. There are also immutable sets in Python, which can map
as a dictionary where all the matching values are null. There are
Python parser (like PyYAML) which happily deal with the expanded
nature of "keys".

Please. No.


> Cheers,
> Andrey

Best regards,
Peter


>
>
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