import re from lxml import etree import six if six.PY3: unicode = str # parsing functions def is_xnat_error(message): a = [''] try: return message.startswith(a[0]) or message.startswith(a[1]) except TypeError: if isinstance(message, bytes): a = [bytes(e, 'utf-8') for e in a] return message.startswith(a[0]) or message.startswith(a[1]) def parse_error_message(message): try: if message.startswith(''): message_tree = etree.XML(message) error_tag = message_tree.find('.//h3') if error_tag: error = error_tag.xpath("string()") elif message.startswith('