# -*- coding: utf-8 -*-from xml.etree import cElementTreefrom xml.etree.cElementTree import ParseError if hasattr(cElementTree, 'ParseError'):    _ETREE_EXCEPTIONS = (ParseError, AttributeError, ValueError, TypeError)else:    _ETREE_EXCEPTIONS = (SyntaxError, AttributeError, ValueError, TypeError) _STS_NS = {'sts': 'https://sts.amazonaws.com/doc/2011-06-15/'}  class STSElement(object):    """STS aware XML parsing class. Wraps a root element name and    cElementTree.Element instance. Provides STS namespace aware parsing    functions.     """     def __init__(self, root_name, element):        self.root_name = root_name        self.element = element     @classmethod    def fromstring(cls, root_name, data):        """Initialize STSElement from name and XML string data.         :param name: Name for XML data. Used in XML errors.        :param data: string data to be parsed.        :return: Returns an STSElement.        """        try:            return cls(root_name, cElementTree.fromstring(data))        except _ETREE_EXCEPTIONS as error:            raise InvalidXMLError(                '"{}" XML is not parsable. Message: {}'.format(                    root_name, error.message                )            )     def findall(self, name):        """Similar to ElementTree.Element.findall()         """        return [            STSElement(self.root_name, elem)            for elem in self.element.findall('sts:{}'.format(name), _STS_NS)        ]     def find(self, name):        """Similar to ElementTree.Element.find()         """        elt = self.element.find('sts:{}'.format(name), _STS_NS)        return STSElement(self.root_name, elt) if elt is not None else None     def get_child_text(self, name, strict=True):        """Extract text of a child element. If strict, and child element is        not present, raises InvalidXMLError and otherwise returns        None.         """        if strict:            try:                return self.element.find('sts:{}'.format(name), _STS_NS).text            except _ETREE_EXCEPTIONS as error:                raise InvalidXMLError(                    ('Invalid XML provided for "{}" - erroring tag <{}>. '                     'Message: {}').format(self.root_name, name, error.message)                )        else:            return self.element.findtext('sts:{}'.format(name), None, _STS_NS)     def text(self):        """Fetch the current node's text         """        return self.element.text