Fucking Python xml ETree vs cETree

fuck_xml.py

# Imports
import xml.etree.ElementTree as py_etree
import xml.etree.cElementTree as c_etree

text = "<foo>&fucking;</foo>"

# Exception
py_etree.fromstring(text)
"""
Traceback (most recent call last):
  File "<input>", line 1, in <module>
  File "/usr/lib/python2.7/xml/etree/ElementTree.py", line 1311, in XML
    parser.feed(text)
  File "/usr/lib/python2.7/xml/etree/ElementTree.py", line 1653, in feed
    self._raiseerror(v)
  File "/usr/lib/python2.7/xml/etree/ElementTree.py", line 1517, in _raiseerror
    raise err
ParseError: undefined entity: line 1, column 5
"""

c_etree.fromstring(text)
"""
Traceback (most recent call last):
  File "<input>", line 1, in <module>
  File "<string>", line 124, in XML
ParseError: undefined entity: line 1, column 5
"""

# Let's defint this entity
parser = py_etree.XMLParser()
parser.parser.UseForeignDTD(True)
parser.entity['fucking'] = 'FUCKING SUPPORTED'
py_etree.fromstring(text, parser=parser)
# OK!!! <Element 'foo' at 0x7f4b7adc3a90>

# Let's do it withi cElementTree
parser = c_etree.XMLParser()
parser.parser.UseForeignDTD(True)
"""
Traceback (most recent call last):
  File "<input>", line 1, in <module>
AttributeError: parser
"""
# Fuck! this should be API compatible?


# Ahoter example
parser = py_etree.XMLParser()
parser.parser.UseForeignDTD(True)
parser.entity['fucking'] = 'FUCKING SUPPORTED'
py_etree.XML(text, parser)

# Let's do it with c_tree
parser = c_etree.XMLParser()
parser.entity['fucking'] = 'FUCKING SUPPORTED'
c_etree.XML(text, parser)
"""
Traceback (most recent call last):
  File "<input>", line 1, in <module>
TypeError: XML() takes exactly 1 argument (2 given)
"""