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| -rw-r--r-- | Doc/whatsnew/whatsnew25.tex | 83 |
1 files changed, 75 insertions, 8 deletions
diff --git a/Doc/whatsnew/whatsnew25.tex b/Doc/whatsnew/whatsnew25.tex index 635c276..187f873 100644 --- a/Doc/whatsnew/whatsnew25.tex +++ b/Doc/whatsnew/whatsnew25.tex @@ -5,8 +5,6 @@ % Fix XXX comments % Distutils upload (PEP 243) % The easy_install stuff -% xml.etree section -% added sqlite3 \title{What's New in Python 2.5} \release{0.1} @@ -1087,19 +1085,88 @@ introduction that shows some basic usage of the module. \subsection{The ElementTree package} A subset of Fredrik Lundh's ElementTree library for processing XML has -been added to the standard library as \module{xml.etree}. The +been added to the standard library as \module{xmlcore.etree}. The vailable modules are \module{ElementTree}, \module{ElementPath}, and \module{ElementInclude} from ElementTree 1.2.6. The \module{cElementTree} accelerator module is also included. -In subsequent alpha releases of Python 2.5, I'll add a brief -introduction that will provide a page-long overview of using -ElementTree. Full documentation for -ElementTree is available at \url{http://effbot.org/zone/element-index.htm}. +The rest of this section will provide a brief overview of using +ElementTree. Full documentation for ElementTree is available at +\url{http://effbot.org/zone/element-index.htm}. + +ElementTree represents an XML document as a tree of element nodes. +The text content of the document is stored as the \member{.text} +and \member{.tail} attributes of +(This is one of the major differences between ElementTree and +the Document Object Model; in the DOM there are many different +types of node, including \class{TextNode}.) + +The most commonly used parsing function is \function{parse()}, that +takes either a string (assumed to contain a filename) or a file-like +object and returns an \class{ElementTree} instance: + +\begin{verbatim} +from xmlcore.etree import ElementTree as ET + +tree = ET.parse('ex-1.xml') + +feed = urllib.urlopen( + 'http://planet.python.org/rss10.xml') +tree = ET.parse(feed) +\end{verbatim} + +Once you have an \class{ElementTree} instance, you +can call its \method{getroot()} method to get the root \class{Element} node. + +There's also an \function{XML()} function that takes a string literal +and returns an \class{Element} node (not an \class{ElementTree}). +This function provides a tidy way to incorporate XML fragments, +approaching the convenience of an XML literal: + +\begin{verbatim} +svg = et.XML("""<svg width="10px" version="1.0"> + </svg>""") +svg.set('height', '320px') +svg.append(elem1) +\end{verbatim} + +Each XML element supports some dictionary-like and some list-like +access methods. Dictionary-like methods are used to access attribute +values, and list-like methods are used to access child nodes. + +% XXX finish this + +To generate XML output, you should call the +\method{ElementTree.write()} method. Like \function{parse()}, +it can take either a string or a file-like object: + +\begin{verbatim} +# Encoding is US-ASCII +tree.write('output.xml') + +# Encoding is UTF-8 +f = open('output.xml', 'w') +tree.write(f, 'utf-8') +\end{verbatim} + +(Caution: the default encoding used for output is ASCII, which isn't +very useful for general XML work, raising an exception if there are +any characters with values greater than 127. You should always +specify a different encoding such as UTF-8 that can handle any Unicode +character.) + % XXX write introduction +\begin{seealso} + +\seeurl{http://effbot.org/zone/element-index.htm} +{Official documentation for ElementTree.} + + +\end{seealso} + \subsection{The hashlib package} @@ -1373,6 +1440,6 @@ changes to your code: The author would like to thank the following people for offering suggestions, corrections and assistance with various drafts of this -article: Thomas Wouters. +article: Mike Rovner, Thomas Wouters. \end{document} |