etree.py 文件源码

def etree_tostring(elem, indent='', max_lines=None, spaces_for_tab=4):
    if PY3:
        lines = ElementTree.tostring(elem, encoding="unicode").splitlines()
    else:
        # noinspection PyCompatibility
        lines = unicode(ElementTree.tostring(elem)).splitlines()
    while lines and not lines[-1].strip():
        lines.pop(-1)
    lines[-1] = '  %s' % lines[-1].strip()

    if max_lines is not None:
        if indent:
            xml_text = '\n'.join([indent + line for line in lines[:max_lines]])
        else:
            xml_text = '\n'.join(lines[:max_lines])
        if len(lines) > max_lines + 2:
            xml_text += '\n%s    ...\n%s%s' % (indent, indent, lines[-1])
        elif len(lines) > max_lines:
            xml_text += '\n%s%s\n%s%s' % (indent, lines[-2], indent, lines[-1])
    elif indent:
        xml_text = '\n'.join([indent + line for line in lines])
    else:
        xml_text = '\n'.join(lines)

    return xml_text.replace('\t', ' ' * spaces_for_tab) if spaces_for_tab else xml_text