Hi all,
Following an initial post by Paulo from mandriva I started
to look at using sage with python-2.7 (2.7.1 in fact).
The news is two fold:
1) sage seems to work ok. It starts.
2) a good deal of the test suite is shot.
As a consequence of 2 it is difficult to work out which parts
need to be checked.
The main issue is the migration to unittest2 back from python-3.
In unittest2 the behavior of assertEqual as changed and by default
doesn't know anything about derived type leading to a pile of stuff
like this:
sage -t -force_lib "devel/sage/sage/algebras/affine_nil_temperley_lieb.py"
^[[?
1034h**********************************************************************
File
"/Users/frb15/Desktop/Gentoo/usr/share/sage/devel/sage/sage/algebras/affine_nil_temperley_lieb.py",
line 57:
sage: TestSuite(A).run()
Expected nothing
Got:
Failure in _test_an_element:
Traceback (most recent call last):
File "/Users/frb15/Desktop/Gentoo/usr/lib/python2.7/site-
packages/sage/misc/sage_unittest.py", line 275, in run
test_method(tester = tester)
File "/Users/frb15/Desktop/Gentoo/usr/lib/python2.7/site-
packages/sage/categories/sets_cat.py", line 388, in _test_an_element
tester.assertEqual(self(an_element), an_element, "element construction
is not idempotent")
File "/Users/frb15/Desktop/Gentoo/usr/lib/python2.7/unittest/case.py",
line 493, in assertEqual
assertion_func = self._getAssertEqualityFunc(first, second)
File "/Users/frb15/Desktop/Gentoo/usr/lib/python2.7/unittest/case.py",
line 476, in _getAssertEqualityFunc
asserter = self._type_equality_funcs.get(type(first))
AttributeError: 'InstanceTester' object has no attribute
'_type_equality_funcs'
------------------------------------------------------------
Failure in _test_eq:
Traceback (most recent call last):
File "/Users/frb15/Desktop/Gentoo/usr/lib/python2.7/site-
packages/sage/misc/sage_unittest.py", line 275, in run
test_method(tester = tester)
File "element.pyx", line 533, in
sage.structure.element.Element._test_eq (sage/structure/element.c:3896)
File "/Users/frb15/Desktop/Gentoo/usr/lib/python2.7/unittest/case.py",
line 493, in assertEqual
assertion_func = self._getAssertEqualityFunc(first, second)
File "/Users/frb15/Desktop/Gentoo/usr/lib/python2.7/unittest/case.py",
line 476, in _getAssertEqualityFunc
asserter = self._type_equality_funcs.get(type(first))
AttributeError: 'InstanceTester' object has no attribute
'_type_equality_funcs'
------------------------------------------------------------
Failure in _test_pickling:
Traceback (most recent call last):
File "/Users/frb15/Desktop/Gentoo/usr/lib/python2.7/site-
packages/sage/misc/sage_unittest.py", line 275, in run
test_method(tester = tester)
File "sage_object.pyx", line 396, in
sage.structure.sage_object.SageObject._test_pickling
(sage/structure/sage_object.c:312$
File "/Users/frb15/Desktop/Gentoo/usr/lib/python2.7/unittest/case.py",
line 493, in assertEqual
assertion_func = self._getAssertEqualityFunc(first, second)
File "/Users/frb15/Desktop/Gentoo/usr/lib/python2.7/unittest/case.py",
line 476, in _getAssertEqualityFunc
asserter = self._type_equality_funcs.get(type(first))
AttributeError: 'InstanceTester' object has no attribute
'_type_equality_funcs'
There are a few issues of numerical and formatting noise here and there
but because of the number of failures of assertEqual the signal to noise ratio
is very high.
So if we want to migrate to python-2.7 (or even 3) one day we need a
strategy to fix these tests and document it so that current ongoing development
doesn't lead to further problems.
Bonus point if we can do that while preserving backward compatibility.
Francois
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