Mailman 3 October 2002 - Python-Dev

Fw: MRO 2.2 vs 2.3
by Samuele Pedroni Oct. 6, 2002

Oct. 6, 2002

----- Original Message ----- From: "Robin Becker" <robin(a)jessikat.fsnet.co.uk> Newsgroups: comp.lang.python Sent: Sunday, October 06, 2002 3:21 PM Subject: MRO 2.2 vs 2.3 > Will the C3 method resolution algorithm be back ported into Python > 2.2.x? It appears from the recently updated > > http://www.python.org/2.2.1/descrintro.html#mro > > that this will be used in 2.3, but the PBF version will then be out of > step with the future. > -- > Robin Becker

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Re: [snake-farm] Autodetect /usr/ccs/bin?
by Mats Wichmann Oct. 6, 2002

Oct. 6, 2002

>[Anders Qvist] >> Several machines in the snake farm fail to build libpython2.3 because >> they don't have ar in their path. ar, ld and the like live in >> /usr/ccs/bin, which seems to be some kind of standard (for generous >> values of standard) as both SunOS 5.8, AIX 4.3 and HP/UX 11.00 seems >> ot have this dir. >> >> Should the configure script try with /usr/ccs/bin/ar and ld if none is >> explicitly supplied? > >This may … [View More]

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Testing the 2.2.2 email pkg
by Tim Peters Oct. 6, 2002

Oct. 6, 2002

Under current 2.2 CVS, running python ../lib/test/regrtest.py test_email.py from my test directory works fine. But running test_email.py directly is a disaster: python ../lib/test/test_email.py There's too much failure output to include here reasonably. Bottom line is: """ ........................FFFFFFFFFFFFFFFFFFFF...................E..FF.F. .....F..F......E......E.....E....F......................F.F............ .F.F.F............F..F ... Ran 164 tests in 0.930s FAILED (failures=33, … [View More]

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Weekly Python Bug/Patch Summary
by Skip Montanaro Oct. 6, 2002

Oct. 6, 2002

Bug/Patch Summary ----------------- 293 open / 2905 total bugs (+1) 112 open / 1719 total patches (+3) New Bugs -------- packages doc in the tutorial (2002-09-29) http://python.org/sf/616211 plat-linux2/IN.py FutureWarning's (2002-10-03) http://python.org/sf/618012 overflow error in calendar module (2002-10-03) http://python.org/sf/618146 Windows binary missing IPv6 support (2002-10-04) http://python.org/sf/618593 Connecting to IPv4 addrs from IPv6 socke (2002-10-04) http://python.org/… [View More]

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2.2 versus test_trace
by Tim Peters Oct. 6, 2002

Oct. 6, 2002

The CVS test_trace.py is failing for me when run under the debug build *and* with -O. """ C:\Code\22\PCbuild>python_d -O ../lib/test/test_trace.py Adding parser accelerators ... Done. test_1_basic (__main__.TraceTestCase) ... FAIL test_2_arigo (__main__.TraceTestCase) ... FAIL test_3_one_instr (__main__.TraceTestCase) ... FAIL test_4_no_pop_blocks (__main__.TraceTestCase) ... FAIL test_5_no_pop_tops (__main__.TraceTestCase) ... FAIL test_6_call (__main__.TraceTestCase) ... FAIL test_7_raise … [View More](__main__.TraceTestCase) ... FAIL test_8_settrace_and_return (__main__.TraceTestCase) ... FAIL test_9_settrace_and_raise (__main__.TraceTestCase) ... FAIL ====================================================================== FAIL: test_1_basic (__main__.TraceTestCase) ---------------------------------------------------------------------- Traceback (most recent call last): File "../lib/test/test_trace.py", line 173, in test_1_basic self.run_test(basic) File "../lib/test/test_trace.py", line 163, in run_test tracer.events, func.events) File "../lib/test/test_trace.py", line 154, in compare_events map(str, events)))) File "C:\CODE\22\lib\unittest.py", line 254, in fail raise self.failureException, msg AssertionError: events did not match expectation: (0, 'call') - (0, 'line') - (1, 'line') - (1, 'return') ? ^ + (0, 'return') ? ^ ====================================================================== FAIL: test_2_arigo (__main__.TraceTestCase) ---------------------------------------------------------------------- Traceback (most recent call last): File "../lib/test/test_trace.py", line 175, in test_2_arigo self.run_test(arigo_example) File "../lib/test/test_trace.py", line 163, in run_test tracer.events, func.events) File "../lib/test/test_trace.py", line 154, in compare_events map(str, events)))) File "C:\CODE\22\lib\unittest.py", line 254, in fail raise self.failureException, msg AssertionError: events did not match expectation: (0, 'call') - (0, 'line') - (1, 'line') - (2, 'line') - (3, 'line') - (3, 'line') - (5, 'line') - (5, 'return') ? ^ + (0, 'return') ? ^ ====================================================================== FAIL: test_3_one_instr (__main__.TraceTestCase) ---------------------------------------------------------------------- Traceback (most recent call last): File "../lib/test/test_trace.py", line 177, in test_3_one_instr self.run_test(one_instr_line) File "../lib/test/test_trace.py", line 163, in run_test tracer.events, func.events) File "../lib/test/test_trace.py", line 154, in compare_events map(str, events)))) File "C:\CODE\22\lib\unittest.py", line 254, in fail raise self.failureException, msg AssertionError: events did not match expectation: (0, 'call') - (0, 'line') - (1, 'line') - (2, 'line') - (3, 'line') - (3, 'return') ? ^ + (0, 'return') ? ^ ====================================================================== FAIL: test_4_no_pop_blocks (__main__.TraceTestCase) ---------------------------------------------------------------------- Traceback (most recent call last): File "../lib/test/test_trace.py", line 179, in test_4_no_pop_blocks self.run_test(no_pop_blocks) File "../lib/test/test_trace.py", line 163, in run_test tracer.events, func.events) File "../lib/test/test_trace.py", line 154, in compare_events map(str, events)))) File "C:\CODE\22\lib\unittest.py", line 254, in fail raise self.failureException, msg AssertionError: events did not match expectation: (0, 'call') - (0, 'line') - (1, 'line') - (1, 'line') - (3, 'line') - (3, 'return') ? ^ + (0, 'return') ? ^ ====================================================================== FAIL: test_5_no_pop_tops (__main__.TraceTestCase) ---------------------------------------------------------------------- Traceback (most recent call last): File "../lib/test/test_trace.py", line 181, in test_5_no_pop_tops self.run_test(no_pop_tops) File "../lib/test/test_trace.py", line 163, in run_test tracer.events, func.events) File "../lib/test/test_trace.py", line 154, in compare_events map(str, events)))) File "C:\CODE\22\lib\unittest.py", line 254, in fail raise self.failureException, msg AssertionError: events did not match expectation: (0, 'call') - (0, 'line') - (1, 'line') - (2, 'line') - (2, 'line') - (3, 'line') - (6, 'line') - (2, 'line') - (3, 'line') - (4, 'line') - (2, 'line') - (2, 'return') ? ^ + (0, 'return') ? ^ ====================================================================== FAIL: test_6_call (__main__.TraceTestCase) ---------------------------------------------------------------------- Traceback (most recent call last): File "../lib/test/test_trace.py", line 183, in test_6_call self.run_test(call) File "../lib/test/test_trace.py", line 163, in run_test tracer.events, func.events) File "../lib/test/test_trace.py", line 154, in compare_events map(str, events)))) File "C:\CODE\22\lib\unittest.py", line 254, in fail raise self.failureException, msg AssertionError: events did not match expectation: (0, 'call') - (0, 'line') - (1, 'line') (-3, 'call') - (-3, 'line') - (-2, 'line') - (-2, 'return') ? ^ + (-3, 'return') ? ^ - (1, 'return') ? ^ + (0, 'return') ? ^ ====================================================================== FAIL: test_7_raise (__main__.TraceTestCase) ---------------------------------------------------------------------- Traceback (most recent call last): File "../lib/test/test_trace.py", line 185, in test_7_raise self.run_test(test_raise) File "../lib/test/test_trace.py", line 163, in run_test tracer.events, func.events) File "../lib/test/test_trace.py", line 154, in compare_events map(str, events)))) File "C:\CODE\22\lib\unittest.py", line 254, in fail raise self.failureException, msg AssertionError: events did not match expectation: (0, 'call') - (0, 'line') - (1, 'line') - (2, 'line') (-3, 'call') - (-3, 'line') - (-2, 'line') - (-2, 'exception') ? ^ + (-3, 'exception') ? ^ - (2, 'exception') ? ^ + (0, 'exception') ? ^ - (3, 'line') - (4, 'line') - (4, 'return') ? ^ + (0, 'return') ? ^ ====================================================================== FAIL: test_8_settrace_and_return (__main__.TraceTestCase) ---------------------------------------------------------------------- Traceback (most recent call last): File "../lib/test/test_trace.py", line 188, in test_8_settrace_and_return self.run_test2(settrace_and_return) File "../lib/test/test_trace.py", line 170, in run_test2 tracer.events, func.events) File "../lib/test/test_trace.py", line 154, in compare_events map(str, events)))) File "C:\CODE\22\lib\unittest.py", line 254, in fail raise self.failureException, msg AssertionError: events did not match expectation: - (1, 'return') ? ^ + (0, 'return') ? ^ ====================================================================== FAIL: test_9_settrace_and_raise (__main__.TraceTestCase) ---------------------------------------------------------------------- Traceback (most recent call last): File "../lib/test/test_trace.py", line 190, in test_9_settrace_and_raise self.run_test2(settrace_and_raise) File "../lib/test/test_trace.py", line 170, in run_test2 tracer.events, func.events) File "../lib/test/test_trace.py", line 154, in compare_events map(str, events)))) File "C:\CODE\22\lib\unittest.py", line 254, in fail raise self.failureException, msg AssertionError: events did not match expectation: - (2, 'exception') ? ^ + (0, 'exception') ? ^ - (3, 'line') - (4, 'line') - (4, 'return') ? ^ + (0, 'return') ? ^ ---------------------------------------------------------------------- Ran 9 tests in 0.220s FAILED (failures=9) Traceback (most recent call last): File "../lib/test/test_trace.py", line 216, in ? test_main() File "../lib/test/test_trace.py", line 212, in test_main test_support.run_unittest(TraceTestCase) File "../lib/test\test_support.py", line 180, in run_unittest run_suite(unittest.makeSuite(testclass), testclass) File "../lib/test\test_support.py", line 174, in run_suite raise TestFailed(msg) test_support.TestFailed: errors occurred in __main__.TraceTestCase [6768 refs] C:\Code\22\PCbuild> """ It also fails under the release build with -O. It does not fail in either build if I leave -O off. This smells familiar, and I think I fixed this before. I don't want to fix it again <wink>. [View Less]

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test_pep277 vs Win98
by Tim Peters Oct. 5, 2002

Oct. 5, 2002

The newish test_pep277 fails on Win98SE, then leaves behind a directory named @test that causes 4 later tests to fail for bogus reasons. Anyone know whether this test is supposed to work <wink>? Mark, Martin? C:\Code\python\PCbuild>python ../lib/test/test_pep277.py test_directory (__main__.UnicodeFileTests) ... ERROR test_failures (__main__.UnicodeFileTests) ... ERROR test_listdir (__main__.UnicodeFileTests) ... ERROR test_open (__main__.UnicodeFileTests) ... ERROR test_rename (… [View More]__main__.UnicodeFileTests) ... ERROR ====================================================================== ERROR: test_directory (__main__.UnicodeFileTests) ---------------------------------------------------------------------- Traceback (most recent call last): File "../lib/test/test_pep277.py", line 31, in setUp f = open(name, 'w') IOError: [Errno 2] No such file or directory: '@test\\Ge??-sa?' ====================================================================== ERROR: test_failures (__main__.UnicodeFileTests) ---------------------------------------------------------------------- Traceback (most recent call last): File "../lib/test/test_pep277.py", line 31, in setUp f = open(name, 'w') IOError: [Errno 2] No such file or directory: '@test\\Ge??-sa?' ====================================================================== ERROR: test_listdir (__main__.UnicodeFileTests) ---------------------------------------------------------------------- Traceback (most recent call last): File "../lib/test/test_pep277.py", line 31, in setUp f = open(name, 'w') IOError: [Errno 2] No such file or directory: '@test\\Ge??-sa?' ====================================================================== ERROR: test_open (__main__.UnicodeFileTests) ---------------------------------------------------------------------- Traceback (most recent call last): File "../lib/test/test_pep277.py", line 31, in setUp f = open(name, 'w') IOError: [Errno 2] No such file or directory: '@test\\Ge??-sa?' ====================================================================== ERROR: test_rename (__main__.UnicodeFileTests) ---------------------------------------------------------------------- Traceback (most recent call last): File "../lib/test/test_pep277.py", line 31, in setUp f = open(name, 'w') IOError: [Errno 2] No such file or directory: '@test\\Ge??-sa?' ---------------------------------------------------------------------- Ran 5 tests in 0.270s FAILED (errors=5) Traceback (most recent call last): File "../lib/test/test_pep277.py", line 106, in ? test_main() File "../lib/test/test_pep277.py", line 103, in test_main run_suite(suite) File "C:\CODE\PYTHON\lib\test\test_support.py", line 187, in run_suite raise TestFailed(msg) test.test_support.TestFailed: errors occurred; run in verbose mode for details C:\Code\python\PCbuild> [View Less]

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Python 2.2.2 beta release on Monday!
by Guido van Rossum Oct. 5, 2002

Oct. 5, 2002

I plan to do a Python 2.2.2 beta release this Monday (if Fred's and Tim's time is available to do their part). Please finish your changes to 2.2.2 before the weekend is over! Remember, use "cvs update -r release22-maint" to check out the 2.2.2 release branch. --Guido van Rossum (home page: http://www.python.org/~guido/)

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Python with MinGW-2.0?
by David Abrahams Oct. 4, 2002

Oct. 4, 2002

Sorry if this is only mildly on-topic. If anyone here has successfully used MinGW-2.0 to build an extension module, please contact me. I'd really like to support this platform for the upcoming Boost.Python release, but it appears that MinGW-2.0 is unable to link to imported data (e.g. PyType_Type) from a stock Win32 import library such as the one that comes with the regular Windows install of Python. TIA, Dave ----------------------------------------------------------- David … [View More]

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Re: PEP 285 (Adding a bool type) extending it further
by Marcelo Matus Oct. 4, 2002

Oct. 4, 2002

To solve the problem of short-circuiting 'and' and 'or', the BooleanMethod class could be tested for non zero method components, ie, you befine the methods to null, like PyBooleanMethods { binaryfunc bl_and; binaryfunc bl_or; binaryfunc bl_not; } PyBooleanMethods; static PyBooleanMethods default_as_boolean = { 0, /* bl_and */ 0, /* bl_or */ 0, /* bl_not */ }; and overwrite them only when the __land__, __lor__ or __lnot__ are defined. Then, when you perfom the 'add'… [View More]

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perplexed by mro
by Samuele Pedroni Oct. 4, 2002

Oct. 4, 2002

I'm trying to wrap my head around the mro computation in 2.2. First issue: PEP 253 and the descrintro document describe an algorithm, typeobject.c implements a rather different one. Descrintro mentions that. The algorithm described by descrintro, PEP253: "Using the classic lookup rule, construct the list of classes that would be searched, including duplicates. Now for each class that occurs in the list multiple times, remove all occurrences except for the last." which, if I understand … [View More]correctly, means : do a left-right dfs of the class hierarchy and then discard all but the last occurence of each class. Now descrintro says that the result of this and the real algorithm in typeobject are the same, unless "two given base classes occur in a different order in the inheritance list of two different derived classes, and those derived classes are both inherited by yet another class" But here is an example where the criterium does not apply but still the algorithms' results diverge: >>> cpl.ex5(globals()) class a(object): pass class b(object): pass class c(object): pass class x(a): pass class y(a): pass class z(x,b,y,c): pass >>> cpl.names(z.__mro__) # just the class names, real 2.2 mro algo ['z', 'x', 'y', 'a', 'b', 'c', 'object'] >>> cpl.names(cpl.keeplast(cpl.lrdfs(z))) # descrintro simple algo ['z', 'x', 'b', 'y', 'a', 'c', 'object'] I was not able to find a new rule. My intuition is that when the result of the real mro has something to do with the dfs, it is sure from the beginning of it not the end, so the relation of the two algos is unclear. In general I have an hard time trying to predict the result of the real mro algo. Does it a have a list of constraints it enforces/preserves, of the qualities it has? I have tried to compare it to the algorithms used by Dylan and CLOS and others, described in this paper http://www.webcom.com/haahr/dylan/linearization-oopsla96.html they are described in terms such as quality criteria and constraints they preserve. Let's consider this example: >>> cpl.ex9(globals()) class a(object): pass class b(object): pass class c(object): pass class d(object): pass class e(object): pass class k1(a,b,c): pass class k2(d,b,e): pass class k3(d,a): pass class z(k1,k2,k3): pass >>> cpl.names(z.__mro__) ['z', 'k1', 'k3', 'a', 'k2', 'd', 'b', 'c', 'e', 'object'] the thing that leaves me most perplexed is that k3 appears before k2. All other algortihms I know would put k2 before k3. E.g. C3 (see paper) ... >>> cpl.names(cpl.c3_cpl(z)) ['z', 'k1', 'k2', 'k3', 'd', 'a', 'b', 'c', 'e', 'object'] or the descrintro simple algo: >>> cpl.names(cpl.keeplast(cpl.lrdfs(z))) ['z', 'k1', 'c', 'k2', 'b', 'e', 'k3', 'd', 'a', 'object'] This means that it does not preserve the local precedence lists (i.e. the inheritance list), it is not monotonic* because otherwise it would put d before a, it seems to preserve "some" aspects of the dfs traversal a,d vs d,a but still it puts k3 before k2. The other hypothesis, is that in this case, the algorithm should fail, because it cannot merge the result of mro(k1) merged with mro(k2) with mro(k3), because the latter is inconsistent with what obtained so far? >>> l=cpl.names(k1.__mro__) >>> l ['k1', 'a', 'b', 'c', 'object'] >>> r=cpl.names(k2.__mro__) >>> cpl.conservative_merge(l,r) ... >>> l ['k1', 'a', 'k2', 'd', 'b', 'c', 'e', 'object'] vs. >>> cpl.names(k3.__mro__) ['k3', 'd', 'a', 'object'] a<d is incosistent with d<a But then this inconsistency rule is different/subtler than the one sketched in descrintro. So can someone (Guido?) summarize the qualities of this rule? is there a paper that describes it? or should I buy the book? regards. * the mro of a subclass is an extension without re-ordering of the mros of the superclasses. [View Less]

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