Re: [Python-Dev] Dropping bytes "support" in json

[Barry Warsaw]

On Apr 10, 2009, at 1:19 AM, gl...@divmod.com wrote:

On 02:38 am, ba...@python.org wrote:

So, what I'm really asking is this. Let's say you agree that there are use cases for accessing a header value as either the raw encoded bytes or the decoded unicode. What should this return:

>>> message['Subject']

The raw bytes or the decoded unicode?

  message.headers['Subject']
  message.bytes_headers['Subject']

My personal preference would be to just get deprecate this API, and get rid of it, replacing it with a slightly more explicit one.

This is pretty darn clever Glyph.  Stop that! :)

I'm not 100% sure I like the name .bytes_headers or that .headers should be the decoded header (rather than have .headers return the bytes thingie and say .decoded_headers return the decoded thingies), but I do like the general approach.

Now, setting headers. Sometimes you have some unicode thing and sometimes you have some bytes. You need to end up with bytes in the ASCII range and you'd like to leave the header value unencoded if so. But in both cases, you might have bytes or characters outside that range, so you need an explicit encoding, defaulting to utf-8 probably.

  message.headers['Subject'] = 'Some text'

should be equivalent to

  message.headers['Subject'] = Header('Some text')

Yes, absolutely. I think we're all in general agreement that header values should be instances of Header, or subclasses thereof.

My preference would be that

  message.headers['Subject'] = b'Some Bytes'



  message.bytes_headers['Subject'] = b'Some Bytes'

or



Explicit is better than implicit, right?

would simply raise an exception. If you've got some bytes, you should instead do message.headers['Subject'] = Header(bytes=b'Some Bytes', encoding='utf-8')

Yes.



-Barry

Again, I really like the general idea, if I might quibble about some of the details. Thanks for a great suggestion.

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