[Tutor] unicode mapping doesn't work

[Albert-Jan Roskam]

Thank you! Quite frankly, I didn't know about ordinals *blushes*.

Also, I thought that d.update({k: v}) was equivalent to d[k] = v, but apparently it's not. So thank you twice!

Cheers!!

Albert-Jan



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

In the face of ambiguity, refuse the temptation to guess.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

--- On Thu, 11/26/09, Lie Ryan <lie.1296 at gmail.com> wrote:

From: Lie Ryan <lie.1296 at gmail.com>
Subject: Re: [Tutor] unicode mapping doesn't work
To: tutor at python.org
Date: Thursday, November 26, 2009, 5:33 PM

Albert-Jan Roskam wrote:
> Hi,
> 
> I want to substitute some letters with accents with theire non-accented equivalents. It should be easy, but it doesn't work. What am I doing wrong?
> 
> trans = {}
> funnychars = u"éèêëóòôöáàâäÉÈÊËÓÒÔÖÁÀÂÄ"
> asciichars = "eeeeooooaaaaEEEEOOOOAAAA"
> for f, a in zip(funnychars, asciichars):
>     trans.update({f: a})
> print funnychars.translate(trans) # why doesn't this return the letters without accents?
> 

Perhaps the doc should be more obvious and perhaps unicode.translate is badly designed, but:

translate(...)
    S.translate(table) -> unicode

    Return a copy of the string S, where all characters have been mapped
    through the given translation table, which must be a mapping of
    Unicode ordinals to Unicode ordinals, Unicode strings or None.
    Unmapped characters are left untouched. Characters mapped to None
    are deleted.


it says "mapping of Unicode ordinals to Unicode ordinals, Unicode strings or None"

which reads as a mapping of (int) to (int, unicode, or None).

your translation table is a mapping of (unicode) to (str).

this works:
for f, a in zip(funnychars, asciichars):
    trans.update({ord(f): unicode(a)})

this as well:
for f, a in zip(funnychars, asciichars):
    trans.update({ord(f): ord(a)})


btw, you're updating the dict and creates a new dict for each character then immediately disposing it. Why not just:
for f, a in zip(funnychars, asciichars):
    trans[ord(f)] = ord(a)


_______________________________________________
Tutor maillist  -  Tutor at python.org
To unsubscribe or change subscription options:
http://mail.python.org/mailman/listinfo/tutor



      
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.python.org/pipermail/tutor/attachments/20091126/acec9b3e/attachment.htm>