Demonstrating SAX-based parsing. : sax « XML « Python Tutorial

1. Python Tutorial
2. XML
3. sax

from xml.sax import parse, SAXParseException, ContentHandler

class TagInfoHandler( ContentHandler ):
   def __init__( self, tagName ):
      ContentHandler.__init__( self )
      self.tagName = tagName
      self.depth = 0 

   def startElement( self, name, attributes ):
      if name == self.tagName:
         print "\n%s<%s> started" % ( " " * self.depth, name )

         self.depth += 3

         print "%sAttributes:" % ( " " * self.depth )
         
         for attribute in attributes.getNames():
            print "%s%s = %s" % ( " " * self.depth, attribute,
               attributes.getValue( attribute ) )

   def endElement( self, name ):
      if name == self.tagName:
         self.depth -= 3
         print "%s</%s> ended\n" % ( " " * self.depth, name )

file = "text.xml"
tagName = "tagName"
   
try:
   parse( file, TagInfoHandler( tagName ) )
except IOError, message:
   print "Error reading file:", message

except SAXParseException, message:
   print "Error parsing file:", message