/usr/lib/python3/dist-packages/pygal/etree.py is in python3-pygal 2.4.0-1.
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# This file is part of pygal
#
# A python svg graph plotting library
# Copyright © 2012-2016 Kozea
#
# This library is free software: you can redistribute it and/or modify it under
# the terms of the GNU Lesser General Public License as published by the Free
# Software Foundation, either version 3 of the License, or (at your option) any
# later version.
#
# This library is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
# FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
# details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with pygal. If not, see <http://www.gnu.org/licenses/>.
"""
Wrapper for seamless lxml.etree / xml.etree usage
depending on whether lxml is installed or not.
"""
import os
class Etree(object):
"""Etree wrapper using lxml.etree or standard xml.etree"""
def __init__(self):
"""Create the wrapper"""
from xml.etree import ElementTree as _py_etree
self._py_etree = _py_etree
try:
from lxml import etree as _lxml_etree
self._lxml_etree = _lxml_etree
except ImportError:
self._lxml_etree = None
if os.getenv('NO_LXML', None):
self._etree = self._py_etree
else:
self._etree = self._lxml_etree or self._py_etree
self.lxml = self._etree is self._lxml_etree
def __getattribute__(self, attr):
"""Retrieve attr from current active etree implementation"""
if (attr not in object.__getattribute__(self, '__dict__') and
attr not in Etree.__dict__):
return object.__getattribute__(self._etree, attr)
return object.__getattribute__(self, attr)
def to_lxml(self):
"""Force lxml.etree to be used"""
self._etree = self._lxml_etree
self.lxml = True
def to_etree(self):
"""Force xml.etree to be used"""
self._etree = self._py_etree
self.lxml = False
etree = Etree()
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