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From: Joshua Landau <joshua@landau.ws>
Date: Sun, 11 Aug 2013 10:54:43 +0100
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Subject: Re: Could you verify this, Oh Great Unicode Experts of the Python-List?
To: Chris Angelico <rosuav@gmail.com>
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Xref: csiph.com comp.lang.python:52376

On 11 August 2013 07:24, Chris Angelico <rosuav@gmail.com> wrote:
> On Sun, Aug 11, 2013 at 7:17 AM, Joshua Landau <joshua@landau.ws> wrote:
>> Given tweet =3D b"caf\x65\xCC\x81".decode():
>>
>>     >>> tweet
>>     'caf=C3=A9'
>>
>> But:
>>
>>     >>> len(tweet)
>>     5
>
> You're now looking at the difference between glyphs and combining
> characters. Twitter counts combining characters, so when you build one
> "thing" out of lots of separately-typed parts, it does count as more
> characters.

@https://dev.twitter.com/docs/counting-characters#Definition_of_a_Character
> The "caf=C3=A9" issue mentioned above raises the question of how you coun=
t
> the characters in the Tweet string "caf=C3=A9". To the human eye the leng=
th is
> clearly four characters. Depending on how the data is represented this
> could be either five or six UTF-8 bytes. Twitter does not want to penaliz=
e
> a user for the fact we use UTF-8 or for the fact that the API client in
> question used the longer representation. Therefore, Twitter does count
> "caf=C3=A9" as four characters no matter which representation is sent.

Which would imply that twitter doesn't count combining characters,
even though the web interface seems to.

> Read this article for some arguments on the subject, including a
> number of references to Twitter itself:
>
> http://unspecified.wordpress.com/2012/04/19/the-importance-of-language-le=
vel-abstract-unicode-strings/

I read that *last* time you pointed it out :P. It's a good link, though.

--
Anyhow, it's good to know I haven't been obviously stupid with my
understanding of Unicode. I learnt it all from this list anyway;
wouldn't want to disappoint!