contents = doc.toxml()

def prettyxml(input):
    input = input.replace("><",">\n<")
    output = ''

    indentlevel = -1
    for line in input.split('\n'):
        if line == '<?xml version="1.0" ?>':
            output += line + "\n"
            continue

        if line[:2] != "</":
            indentlevel += 1
            output += "  "*indentlevel + line + "\n"
            if "</" in line:
                indentlevel -= 1
        else:
            output += "  "*indentlevel + line + "\n"
            indentlevel -= 1
    return output

print prettyxml(contents)