How to use the cssselect.xpath.XPathExpr function in cssselect

def xpath_text_node_simple_pseudo_element(self, xpath):
                other = XPathExpr('text()', '', )
                return xpath.join('/', other)

def xpath_attr_functional_pseudo_element(self, xpath, arguments):
                attribute_name = arguments[0].value
                other = XPathExpr('@%s' % attribute_name, '', )
                return xpath.join('/', other)

def xpath_attr_href_simple_pseudo_element(self, xpath):
                other = XPathExpr('@href', '', )
                return xpath.join('/', other)

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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

"""

from __future__ import absolute_import
from __future__ import division
from __future__ import print_function
from __future__ import unicode_literals

from cssselect import GenericTranslator, HTMLTranslator
from cssselect.xpath import _unicode_safe_getattr, XPathExpr, ExpressionError
from cssselect.parser import FunctionalPseudoElement


class CdeXPathExpr(XPathExpr):

    textnode = False
    attribute = None

    @classmethod
    def from_xpath(cls, xpath, textnode=False, attribute=None):
        x = cls(path=xpath.path, element=xpath.element, condition=xpath.condition)
        x.textnode = textnode
        x.attribute = attribute
        return x

    def __str__(self):
        path = super(CdeXPathExpr, self).__str__()
        if self.textnode:
            if path == '*':
                path = 'text()'

from cssselect import GenericTranslator, HTMLTranslator
from cssselect.xpath import _unicode_safe_getattr, XPathExpr, ExpressionError
from cssselect.parser import FunctionalPseudoElement


class ScrapyXPathExpr(XPathExpr):

    textnode = False
    attribute = None

    @classmethod
    def from_xpath(cls, xpath, textnode=False, attribute=None):
        x = cls(path=xpath.path, element=xpath.element, condition=xpath.condition)
        x.textnode = textnode
        x.attribute = attribute
        return x

    def __str__(self):
        path = super(ScrapyXPathExpr, self).__str__()
        if self.textnode:
            if path == '*':
                path = 'text()'

from cssselect import GenericTranslator, HTMLTranslator
from cssselect.xpath import _unicode_safe_getattr, XPathExpr, ExpressionError
from cssselect.parser import FunctionalPseudoElement
from scrapy.selector import XPathSelector, HtmlXPathSelector, XmlXPathSelector


class ScrapyXPathExpr(XPathExpr):

    textnode = False
    attribute = None

    @classmethod
    def from_xpath(cls, xpath, textnode=False, attribute=None):
        x = cls(path=xpath.path, element=xpath.element, condition=xpath.condition)
        x.textnode = textnode
        x.attribute = attribute
        return x

    def __str__(self):
        path = super(ScrapyXPathExpr, self).__str__()
        if self.textnode:
            if path == '*':
                path = 'text()'

import six

if six.PY2:
    from functools32 import lru_cache
else:
    from functools import lru_cache

from cssselect import GenericTranslator as OriginalGenericTranslator
from cssselect import HTMLTranslator as OriginalHTMLTranslator
from cssselect.xpath import XPathExpr as OriginalXPathExpr
from cssselect.xpath import _unicode_safe_getattr, ExpressionError
from cssselect.parser import FunctionalPseudoElement


class XPathExpr(OriginalXPathExpr):

    textnode = False
    attribute = None

    @classmethod
    def from_xpath(cls, xpath, textnode=False, attribute=None):
        x = cls(path=xpath.path, element=xpath.element, condition=xpath.condition)
        x.textnode = textnode
        x.attribute = attribute
        return x

    def __str__(self):
        path = super(XPathExpr, self).__str__()
        if self.textnode:
            if path == '*':
                path = 'text()'