from itertools import chain
from lxml import etree

def stringify_children(node):
    '''
    Return all contents of an xml tree, without the outside tags.
    e.g. if node is parse of
        "<html a="b" foo="bar">Hi <div>there <span>Bruce</span><b>!</b></div><html>"
    should return
        "Hi <div>there <span>Bruce</span><b>!</b></div>"

    fixed from
    http://stackoverflow.com/questions/4624062/get-all-text-inside-a-tag-in-lxml
    '''
    # Useful things to know:

    # node.tostring() -- generates xml for the node, including start
    #                 and end tags.  We'll use this for the children.
    # node.text -- the text after the end of a start tag to the start
    #                 of the first child
    # node.tail -- the text after the end this tag to the start of the
    #                 next element.
    parts = [node.text]
    for c in node.getchildren():
        parts.append(etree.tostring(c, with_tail=True))

    # filter removes possible Nones in texts and tails
    return ''.join(filter(None, parts))
