parameters: (node, tag)
return_statement: return result
docstring: Look through a node's children for a child node with a given tag.
  
    Args:
      root: The node to examine.
      tag: The tag on a child node to look for.
  
    Returns:
      A child node with the given tag, or None.
docstring_summary: Look through a node's children for a child node with a given tag.
docstring_tokens: Look through a node s children for a child node with a given tag .
function: def FindNodeWithTag(node, tag):
    """Look through a node's children for a child node with a given tag.
  
    Args:
      root: The node to examine.
      tag: The tag on a child node to look for.
  
    Returns:
      A child node with the given tag, or None.
    """
    result = None
    for n in node.getchildren():
      if n.tag == tag:
        assert not result
        result = n
    return result
function_tokens: def FindNodeWithTag ( node , tag ) : result = None for n in node . getchildren ( ) : if n . tag == tag : assert not result result = n return result