code: def ctxtReadFile(self, filename, encoding, options):
          
          ret = libxml2mod.xmlCtxtReadFile(self._o, filename, encoding, options)
          if ret is None:raise treeError('xmlCtxtReadFile() failed')
          __tmp = xmlDoc(_obj=ret)
          return __tmp
docs: parse an XML file from the filesystem or the network. This
             reuses the existing @ctxt parser context