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I notice similar problems, as found when running the test suite for lxml 3.5.0 on python2.7
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ERROR: test_etree_parse_io_error (lxml.tests.test_io.ETreeIOTestCase)
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Traceback (most recent call last):
 File "/opt/local/lib/python2.7/unittest/case.py", line 329, in run
 testMethod()
 File "/tmp/pkgsrc/textproc/py-lxml/work/lxml-3.5.0/src/lxml/tests/test_io.py", line 276, in test_etree_parse_io_error
 dn = tempfile.mkdtemp(prefix=dirnameRU)
 File "/opt/local/lib/python2.7/tempfile.py", line 339, in mkdtemp
 _os.mkdir(file, 0700)
UnicodeEncodeError: 'ascii' codec can't encode characters in position 40-53: ordinal not in range(128)
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ERROR: test_etree_parse_io_error (lxml.tests.test_io.ElementTreeIOTestCase)
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Traceback (most recent call last):
 File "/opt/local/lib/python2.7/unittest/case.py", line 329, in run
 testMethod()
 File "/tmp/pkgsrc/textproc/py-lxml/work/lxml-3.5.0/src/lxml/tests/test_io.py", line 276, in test_etree_parse_io_error
 dn = tempfile.mkdtemp(prefix=dirnameRU)
 File "/opt/local/lib/python2.7/tempfile.py", line 339, in mkdtemp
 _os.mkdir(file, 0700)
UnicodeEncodeError: 'ascii' codec can't encode characters in position 40-53: ordinal not in range(128)
the code snippet is in test_io.py", line 276
 266	 def test_etree_parse_io_error(self):
 267		# this is a directory name that contains characters beyond latin-1
 268		dirnameEN = _str('Directory')
 269		dirnameRU = _str('КÐ260円Ñ032円Ð260円Ð273円Ð276円Ð263円')
 270		filename = _str('nosuchfile.xml')
 271		dn = tempfile.mkdtemp(prefix=dirnameEN)
 272		try:
 273		 self.assertRaises(IOError, self.etree.parse, os.path.join(dn, filename))
 274		finally:
 275		 os.rmdir(dn)
 276		dn = tempfile.mkdtemp(prefix=dirnameRU)
 277		try:
 278		 self.assertRaises(IOError, self.etree.parse, os.path.join(dn, filename))
 279		finally:
 280		 os.rmdir(dn)
even if I change dirnameRU to a simple French 'Répertoire' I still get errors...
It is not an option to upgrade to 3.0, sorry.
BTW, I tried passing dirnameRU.encode('utf-8') but that just generates
a different error:
ERROR: test_etree_parse_io_error (lxml.tests.test_io.ETreeIOTestCase)
----------------------------------------------------------------------
Traceback (most recent call last):
 File "/opt/local/lib/python2.7/unittest/case.py", line 329, in run
 testMethod()
 File "/tmp/pkgsrc/textproc/py-lxml/work/lxml-3.5.0/src/lxml/tests/test_io.py", line 278, in test_etree_parse_io_error
 self.assertRaises(IOError, self.etree.parse, os.path.join(dn, filename))
 File "/opt/local/lib/python2.7/posixpath.py", line 73, in join
 path += '/' + b
UnicodeDecodeError: 'ascii' codec can't decode byte 0xc3 in position 40: ordinal not in range(128)