diff --git a/Doc/library/xml.etree.elementtree.rst b/Doc/library/xml.etree.elementtree.rst index f55eee0eebe..8eb19f3eded 100644 --- a/Doc/library/xml.etree.elementtree.rst +++ b/Doc/library/xml.etree.elementtree.rst @@ -33,6 +33,9 @@ convert it from and to XML. A C implementation of this API is available as :mod:`xml.etree.cElementTree`. +See http://effbot.org/zone/element-index.htm for tutorials and links to other +docs. Fredrik Lundh's page is also the location of the development version of the +xml.etree.ElementTree. .. _elementtree-functions: @@ -357,6 +360,33 @@ ElementTree Objects object opened for writing. *encoding* is the output encoding (default is US-ASCII). +This is the XML file that is going to be manipulated:: + + + + Example page + + +

Moved to example.org + or example.com.

+ + + +Example of changing the attribute "target" of every link in first paragraph:: + + >>> from xml.etree.ElementTree import ElementTree + >>> tree = ElementTree() + >>> tree.parse("index.xhtml") + + >>> p = tree.find("body/p") # Finds first occurrence of tag p in body + >>> p + + >>> links = p.getiterator("a") # Returns list of all links + >>> links + [, ] + >>> for i in links: # Iterates through all found links + ... i.attrib["target"] = "blank" + >>> tree.write("output.xhtml") .. _elementtree-qname-objects: @@ -442,3 +472,41 @@ XMLTreeBuilder Objects Feeds data to the parser. *data* is encoded data. +:meth:`XMLTreeBuilder.feed` calls *target*\'s :meth:`start` method +for each opening tag, its :meth:`end` method for each closing tag, +and data is processed by method :meth:`data`. :meth:`XMLTreeBuilder.close` +calls *target*\'s method :meth:`close`. +:class:`XMLTreeBuilder` can be used not only for building a tree structure. +This is an example of counting the maximum depth of an XML file:: + + >>> from xml.etree.ElementTree import XMLTreeBuilder + >>> class MaxDepth: # The target object of the parser + ... maxDepth = 0 + ... depth = 0 + ... def start(self, tag, attrib): # Called for each opening tag. + ... self.depth += 1 + ... if self.depth > self.maxDepth: + ... self.maxDepth = self.depth + ... def end(self, tag): # Called for each closing tag. + ... self.depth -= 1 + ... def data(self, data): + ... pass # We do not need to do anything with data. + ... def close(self): # Called when all data has been parsed. + ... return self.maxDepth + ... + >>> target = MaxDepth() + >>> parser = XMLTreeBuilder(target=target) + >>> exampleXml = """ + ... + ... + ... + ... + ... + ... + ... + ... + ... + ... """ + >>> parser.feed(exampleXml) + >>> parser.close() + 4