[Python-Dev] Update PEP 292

[Barry Warsaw]

Raymond and I had a chance to talk about PEP 292 on bug day, and we've
exchanged a few private emails and implementations.  I think we've
finally knocked everything into shape for inclusion in Python 2.4's next
alpha.

In the sandbox you will find the updated implementation, along with
updated tests and documentation (libstring.tex).

The updated PEP is at:

http://www.python.org/peps/pep-0292.html

A summary of the most important changes:

      * Renamed 'dstring' to 'template', and removed the other ?string
        classes
      * Added a 'safe_template' subclass for non KeyError-throwing
        substitutions
      * Got rid of safedicts; Raymond figured out the trick to retain
        optional braces in the safe substitution case without needing
        that class.
      * Renamed the 'cre' class attribute for subclasses to 'pattern'

Now for the controversial bit <wink>.

I still think it's worthwhile to turn the string module into a package. 
The sandbox has an implementation of this that is completely backward
compatible.  I like it because it segregates the deprecated functions
into a separate sub-module and makes the whole shebang easier to
maintain.  It also provides an existing namespace for future expansion,
as has been discussed before.

Please note: PEP 292 is not dependent on the string module -> package
reorganization, so it isn't documented in that PEP.  I don't think it's
worth writing a PEP just for this library reorganization.  Take a look
at the sandbox if you're interested.

http://cvs.sourceforge.net/viewcvs.py/python/python/nondist/sandbox/string/

As far as this aspect of the changes go, I would like BDFL pronouncement
on it.  I'll abide by Guido's decision here.  If he nixes the re-org,
then I propose to put the template and safe_template classes in
Lib/string.py.  The libstring.tex changes will still be relevant.

-Barry

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