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Date: Wed, 14 Jan 2015 22:14:56 +1100
Subject: Re: Performance in exec environnements
From: Chris Angelico <rosuav@gmail.com>
Cc: "python-list@python.org" <python-list@python.org>
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Xref: csiph.com comp.lang.python:83745

On Wed, Jan 14, 2015 at 8:02 PM, Jean-Baptiste Braun
<jbaptiste.braun@gmail.com> wrote:
> What I'm trying to do is to map a transformation description in a markup
> langage (XSLT) in python to improve execution time. Here is a simplification
> of what it looks like :
>
> XSLT :
> <title>
>  <xsl:choose>
>   <xsl:when test="gender='M'">
>    Mr
>   </xsl:when>
>   <xsl:otherwise>
>    Mrs
>   </xsl:otherwise>
>  </xsl:choose>
> </title>
>
> Generated python :
> print('<title>')
> if gender == 'M':
>     print('Mr')
> else:
>     print('Mrs')
> print('</title>')

Would it be possible to do a one-off transformation of the entire XSLT
file into a Python module with a single function in it, and then every
time you need that XSLT, you import that module and call the function?
That would potentially be a lot quicker than exec(), *and* would be
much clearer - there'd be an actual file on the disk with your
generated Python code, and anyone could read it and understand what
it's doing.

ChrisA