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| author | Georg Brandl <georg@python.org> | 2007-12-01 22:42:46 (GMT) |
|---|---|---|
| committer | Georg Brandl <georg@python.org> | 2007-12-01 22:42:46 (GMT) |
| commit | 39bd059e420dd6d621516848d0bc9c46d57cd63c (patch) | |
| tree | 97e32203fed13b237a7ef751858f448d84474fa2 /Doc/library | |
| parent | e4317fade8d6d36cbb61632be64b5be35c619de0 (diff) | |
| download | cpython-39bd059e420dd6d621516848d0bc9c46d57cd63c.zip cpython-39bd059e420dd6d621516848d0bc9c46d57cd63c.tar.gz cpython-39bd059e420dd6d621516848d0bc9c46d57cd63c.tar.bz2 | |
Add examples to the ElementTree documentation.
Written by h4wk.cz for GHOP.
Diffstat (limited to 'Doc/library')
| -rw-r--r-- | Doc/library/xml.etree.elementtree.rst | 68 |
1 files changed, 68 insertions, 0 deletions
diff --git a/Doc/library/xml.etree.elementtree.rst b/Doc/library/xml.etree.elementtree.rst index f55eee0..8eb19f3 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:: + + <html> + <head> + <title>Example page</title> + </head> + <body> + <p>Moved to <a href="http://example.org/">example.org</a> + or <a href="http://example.com/">example.com</a>.</p> + </body> + </html> + +Example of changing the attribute "target" of every link in first paragraph:: + + >>> from xml.etree.ElementTree import ElementTree + >>> tree = ElementTree() + >>> tree.parse("index.xhtml") + <Element html at b7d3f1ec> + >>> p = tree.find("body/p") # Finds first occurrence of tag p in body + >>> p + <Element p at 8416e0c> + >>> links = p.getiterator("a") # Returns list of all links + >>> links + [<Element a at b7d4f9ec>, <Element a at b7d4fb0c>] + >>> 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 = """ + ... <a> + ... <b> + ... </b> + ... <b> + ... <c> + ... <d> + ... </d> + ... </c> + ... </b> + ... </a>""" + >>> parser.feed(exampleXml) + >>> parser.close() + 4 |