[Python-checkins] python/dist/src/Doc/tut tut.tex,1.249,1.250
rhettinger at users.sourceforge.net
rhettinger at users.sourceforge.net
Tue Sep 14 08:32:23 CEST 2004
Update of /cvsroot/python/python/dist/src/Doc/tut
In directory sc8-pr-cvs1.sourceforge.net:/tmp/cvs-serv20327
Modified Files:
tut.tex
Log Message:
Tweak the wording. Improve examples. Make more brief.
Index: tut.tex
===================================================================
RCS file: /cvsroot/python/python/dist/src/Doc/tut/tut.tex,v
retrieving revision 1.249
retrieving revision 1.250
diff -u -d -r1.249 -r1.250
--- tut.tex 14 Sep 2004 05:21:42 -0000 1.249
+++ tut.tex 14 Sep 2004 06:32:20 -0000 1.250
@@ -4841,26 +4841,26 @@
The \ulink{\module{string}}{../lib/module-string.html} module includes a
versatile \class{Template} class with a simplified syntax suitable for
editing by end-users. This allows users to customize their applications
-without having to alter the Python program.
+without having to alter the application.
-The format uses \samp{\$} for placeholder names that are valid Python
+The format uses placeholder names formed by \samp{\$} with valid Python
identifiers (alphanumeric characters and underscores). Surrounding the
placeholder with braces allows it to be followed by more alphanumeric letters
-with no intervening spaces. \samp{\$\$} is the way to create a single escaped
+with no intervening spaces. Writing \samp{\$\$} creates a single escaped
\samp{\$}:
\begin{verbatim}
>>> from string import Template
>>> t = Template('${village}folk send $$10 to $cause.')
->>> t.substitute(village='nottingham', cause='the ditch fund')
-'nottinghamfolk send $10 to the ditch fund.'
+>>> t.substitute(village='Nottingham', cause='the ditch fund')
+'Nottinghamfolk send $10 to the ditch fund.'
\end{verbatim}
The \method{substitute} method raises a \exception{KeyError} when a
-placeholder is not supplied in a dictionary or a keyword argument.
-For mail-merge style applications, user supplied data may be incomplete
-and the \method{safe_substitute} method may be more appropriate --- it
-will leave placeholders unchanged if data is missing:
+placeholder is not supplied in a dictionary or a keyword argument. For
+mail-merge style applications, user supplied data may be incomplete and the
+\method{safe_substitute} method may be more appropriate --- it will leave
+placeholders unchanged if data is missing:
\begin{verbatim}
>>> t = Template('Return the $item to $owner.')
@@ -4875,7 +4875,7 @@
Template subclasses can specify a custom delimiter. For example, a batch
renaming utility for a photo browser may elect to use percent signs for
-metadata such as the current date, image sequence number, or file format:
+placeholders such as the current date, image sequence number, or file format:
\begin{verbatim}
>>> import time, os.path
@@ -4885,11 +4885,11 @@
>>> fmt = raw_input('Enter rename style (%d-date %n-seqnum %f-format): ')
Enter rename style (%d-date %n-seqnum %f-format): Ashley_%n%f
->>> rename = BatchRename(fmt)
+>>> t = BatchRename(fmt)
>>> date = time.strftime('%d%b%y')
>>> for i, filename in enumerate(photofiles):
... base, ext = os.path.splitext(filename)
-... newname = rename.substitute(d=date, n=i, f=ext)
+... newname = t.substitute(d=date, n=i, f=ext)
... print '%s --> %s' % (filename, newname)
img_1074.jpg --> Ashley_0.jpg
@@ -4897,20 +4897,9 @@
img_1077.jpg --> Ashley_2.jpg
\end{verbatim}
-For internationalization applications, it may be appropriate to coerce all
-templates to \class{unicode}. This can be done with subclassing and
-overriding the \method{__init__} method:
-
-\begin{verbatim}
->>> class UnicodeTemplate(unicode, Template):
-... def __init__(self, template):
-... self.template = unicode(template)
->>> t = UnicodeTemplate('Knights who say $what')
->>> t.substitute(what='Ni')
-u'Knights who say Ni'
->>> t.capitalize()
-u'Knights who say $what'
-\end{verbatim}
+Another application for templating is separating program logic from the
+details of multiple output formats. The makes it possible to substitute
+custom templates for XML files, plain text reports, and HMTL web reports.
\section{Working with Binary Data Record Layouts\label{binary-formats}}
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