How to use the tableaudocumentapi.datasource.ConnectionParser function in tableaudocumentapi

def __init__(self, dsxml, filename=None):
        """
        Constructor.  Default is to create datasource from xml.

        """
        self._filename = filename
        self._datasourceXML = dsxml
        self._datasourceTree = ET.ElementTree(self._datasourceXML)
        self._name = self._datasourceXML.get('name') or self._datasourceXML.get(
            'formatted-name')  # TDS files don't have a name attribute
        self._version = self._datasourceXML.get('version')
        self._caption = self._datasourceXML.get('caption', '')
        self._connection_parser = ConnectionParser(
            self._datasourceXML, version=self._version)
        self._connections = self._connection_parser.get_connections()
        self._fields = None