XML : recursively iterate nested python dictionary

I have nested python dictionary like this.

  d = {}  d[a] = b  d[c] = {1:2, 2:3}    

I am trying to recursively convert the nested dictionary into an xml format since there can be more nested dictionary inside such as d[e] = {1:{2:3}, 3:4}. My desired XML format is like this

  <root>    <a>b</a>    <c>      <1>2</1>       <2>3</3>    </c>   </root>    

I have so far this python code to handle nested xml using lxml library. But it doesn't give me the desired output.

  def encode(node, Dict):      if len(Dict) == 0:        return node     for kee, val in Dict.items():        subNode = etree.SubElement(node, kee)       del msgDict[kee]        if not isinstance(val, dict):         subNode.text = str(val)       else:         return encode(subNode, val)    

Any help is appreciated. Thank you.