Merge lp:~uninja/python-snippets/xml-snippets into lp:~jonobacon/python-snippets/trunk

[Travis Nicholl]

SAX and DOM based examples of XML parsing

Unmerged revisions

100. By Travis Nicholl on 2011-05-20

Adding XML snippets

=== added directory 'xml'
=== added file 'xml/dom_parser.py'
--- xml/dom_parser.py	1970-01-01 00:00:00 +0000
+++ xml/dom_parser.py	2011-05-20 01:55:54 +0000
@@ -0,0 +1,29 @@
+#!/usr/bin/env python
+#
+# [SNIPPET_NAME: DOM based XML Parser]
+# [SNIPPET_CATEGORIES: xml]
+# [SNIPPET_DESCRIPTION: Parsing XML with DOM]
+# [SNIPPET_AUTHOR: Travis Nicholl <[e-mail]>]
+# [SNIPPET_LICENSE: GPL]
+
+from xml.dom.minidom import parse
+
+def print_releases(doc):
+    releases = doc.getElementsByTagName('release')
+    for release in releases:
+        print_release(release)
+
+def print_release(release):
+    """ Print information about Ubuntu releases"""
+    print '\nRelease'
+    attrs = release.attributes
+    keys = attrs.keys()
+    keys.sort()
+    for key in keys:
+        print '\t%s: %s' % (key, attrs[key].value)
+
+    print '\tyear: %s' % release.getElementsByTagName('year')[0].childNodes[0].data
+    print '\tmonth: %s' % release.getElementsByTagName('month')[0].childNodes[0].data
+
+doc = parse('ubuntu_releases.xml')
+print_releases(doc)

=== added file 'xml/sax_parser.py'
--- xml/sax_parser.py	1970-01-01 00:00:00 +0000
+++ xml/sax_parser.py	2011-05-20 01:55:54 +0000
@@ -0,0 +1,53 @@
+#!/usr/bin/env python
+#
+# [SNIPPET_NAME: SAX based XML Parser]
+# [SNIPPET_CATEGORIES: xml]
+# [SNIPPET_DESCRIPTION: Parsing XML with SAX]
+# [SNIPPET_AUTHOR: Travis Nicholl <[e-mail]>]
+# [SNIPPET_LICENSE: GPL]
+
+from xml.sax import make_parser, handler
+
+class TestHandler(handler.ContentHandler):
+    """Class that contains callbacks for parsing events"""
+
+    def __init__(self):
+        self.indent_level = 0
+        self.buffer = ""
+        self.in_element = False
+
+    def startElement(self, name, attrs):
+        """Called when the start of an element is found"""
+        print self.indent_level * ' ', name,
+
+        if len(attrs) > 0:
+            print "{",
+            for key in sorted(attrs.keys()):
+                print '%s=\'%s\'' % (key, attrs[key]),
+            print "}"
+
+        self.indent_level += 3
+
+        if name == 'year' or name == 'month' or name == 'lts':
+            self.in_element = True
+            self.buffer = ""
+        elif name == 'releases':
+            print
+
+    def endElement(self, name):
+        """Called when the end of an element is found"""
+        if name == 'year' or name == 'month' or name == 'lts':
+            print self.buffer
+        else:
+            print
+
+        self.indent_level -= 3
+
+    def characters(self, chars):
+        """Called when character data is found"""
+        if self.in_element:
+            self.buffer += chars
+
+parser = make_parser()
+parser.setContentHandler(TestHandler())
+parser.parse('ubuntu_releases.xml')

=== added file 'xml/ubuntu_releases.xml'
--- xml/ubuntu_releases.xml	1970-01-01 00:00:00 +0000
+++ xml/ubuntu_releases.xml	2011-05-20 01:55:54 +0000
@@ -0,0 +1,63 @@
+<?xml version='1.0' encoding='UTF-8'?>
+<releases>
+  <release codename='Warty Warthog' lts='False'>
+    <year>4</year>
+    <month>10</month>
+  </release>
+  <release codename='Hoary Hedgehog' lts='False'>
+    <year>5</year>
+    <month>04</month>
+  </release>
+  <release codename='Breezy Badger' lts='False'>
+    <year>5</year>
+    <month>10</month>
+  </release>
+  <release codename='Dapper Drake' lts='True'>
+    <year>6</year>
+    <month>06</month>
+  </release>
+  <release codename='Edgy Eft' lts='False'>
+    <year>6</year>
+    <month>10</month>
+  </release>
+  <release codename='Feisty Fawn' lts='False'>
+    <year>7</year>
+    <month>04</month>
+  </release>
+  <release codename='Gutsy Gibbon' lts='False'>
+    <year>7</year>
+    <month>10</month>
+  </release>
+  <release codename='Hardy Heron' lts='True'>
+    <year>8</year>
+    <month>04</month>
+  </release>
+  <release codename='Intrepid Ibex' lts='False'>
+    <year>8</year>
+    <month>10</month>
+  </release>
+  <release codename='Jaunty Jackalope' lts='False'>
+    <year>9</year>
+    <month>04</month>
+  </release>
+  <release codename='Karmic Koala' lts='False'>
+    <year>9</year>
+    <month>10</month>
+  </release>
+  <release codename='Lucid Lynx' lts='True'>
+    <year>10</year>
+    <month>04</month>
+  </release>
+  <release codename='Maverick Meerkat' lts='False'>
+    <year>10</year>
+    <month>10</month>
+  </release>
+  <release codename='Natty Narwhal' lts='False'>
+    <year>11</year>
+    <month>04</month>
+  </release>
+  <release codename='Oneiric Ocelot' lts='False'>
+    <year>11</year>
+    <month>10</month>
+  </release>
+</releases>