Okay here is the output of test_bz2 on Python 2.4.1 updated and compiled fresh from CVS, and on Python 2.4.1 from the source archieve from python.org (http://www.python.org/ftp/python/2.4.1/Python-2.4.1.tar.bz2). #----------------------------------------------------------------------------- # Python 2.4.1 compiled from source archieve: # Result: passes #----------------------------------------------------------------------------- $ cd /g/projs/py241-src-arc/mingw $ python ../Lib/test/test_bz2.py testIterator (__main__.BZ2FileTest) ... ok testOpenDel (__main__.BZ2FileTest) ... ok testOpenNonexistent (__main__.BZ2FileTest) ... ok testRead (__main__.BZ2FileTest) ... ok testRead100 (__main__.BZ2FileTest) ... ok testReadChunk10 (__main__.BZ2FileTest) ... ok testReadLine (__main__.BZ2FileTest) ... ok testReadLines (__main__.BZ2FileTest) ... ok testSeekBackwards (__main__.BZ2FileTest) ... ok testSeekBackwardsFromEnd (__main__.BZ2FileTest) ... ok testSeekForward (__main__.BZ2FileTest) ... ok testSeekPostEnd (__main__.BZ2FileTest) ... ok testSeekPostEndTwice (__main__.BZ2FileTest) ... ok testSeekPreStart (__main__.BZ2FileTest) ... ok testUniversalNewlinesCRLF (__main__.BZ2FileTest) ... ok testUniversalNewlinesLF (__main__.BZ2FileTest) ... ok testWrite (__main__.BZ2FileTest) ... ok testWriteChunks10 (__main__.BZ2FileTest) ... ok testWriteLines (__main__.BZ2FileTest) ... ok testXReadLines (__main__.BZ2FileTest) ... ok testCompress (__main__.BZ2CompressorTest) ... ok testCompressChunks10 (__main__.BZ2CompressorTest) ... ok testDecompress (__main__.BZ2DecompressorTest) ... ok testDecompressChunks10 (__main__.BZ2DecompressorTest) ... ok testDecompressUnusedData (__main__.BZ2DecompressorTest) ... ok testEOFError (__main__.BZ2DecompressorTest) ... ok test_Constructor (__main__.BZ2DecompressorTest) ... ok testCompress (__main__.FuncTest) ... ok testDecompress (__main__.FuncTest) ... ok testDecompressEmpty (__main__.FuncTest) ... ok testDecompressIncomplete (__main__.FuncTest) ... ok ---------------------------------------------------------------------- Ran 31 tests in 6.430s OK #----------------------------------------------------------------------------- # Python 2.4.1 compiled from CVS updated even today: # Result: fails #----------------------------------------------------------------------------- $ cd /g/projs/py24/python/dist/src/MinGW $ python ../Lib/test/test_bz2.py testBug1191043 (__main__.BZ2FileTest) ... ERROR ERROR testIterator (__main__.BZ2FileTest) ... ok testModeU (__main__.BZ2FileTest) ... ok testOpenDel (__main__.BZ2FileTest) ... ok testOpenNonexistent (__main__.BZ2FileTest) ... ok testRead (__main__.BZ2FileTest) ... ok testRead100 (__main__.BZ2FileTest) ... ok testReadChunk10 (__main__.BZ2FileTest) ... ok testReadLine (__main__.BZ2FileTest) ... ok testReadLines (__main__.BZ2FileTest) ... ok testSeekBackwards (__main__.BZ2FileTest) ... ok testSeekBackwardsFromEnd (__main__.BZ2FileTest) ... ok testSeekForward (__main__.BZ2FileTest) ... ok testSeekPostEnd (__main__.BZ2FileTest) ... ok testSeekPostEndTwice (__main__.BZ2FileTest) ... ok testSeekPreStart (__main__.BZ2FileTest) ... ok testUniversalNewlinesCRLF (__main__.BZ2FileTest) ... ok testUniversalNewlinesLF (__main__.BZ2FileTest) ... ok testWrite (__main__.BZ2FileTest) ... ok testWriteChunks10 (__main__.BZ2FileTest) ... ok testWriteLines (__main__.BZ2FileTest) ... ok testXReadLines (__main__.BZ2FileTest) ... ok testCompress (__main__.BZ2CompressorTest) ... ok testCompressChunks10 (__main__.BZ2CompressorTest) ... ok testDecompress (__main__.BZ2DecompressorTest) ... ok testDecompressChunks10 (__main__.BZ2DecompressorTest) ... ok testDecompressUnusedData (__main__.BZ2DecompressorTest) ... ok testEOFError (__main__.BZ2DecompressorTest) ... ok test_Constructor (__main__.BZ2DecompressorTest) ... ok testCompress (__main__.FuncTest) ... ok testDecompress (__main__.FuncTest) ... ok testDecompressEmpty (__main__.FuncTest) ... ok testDecompressIncomplete (__main__.FuncTest) ... ok ====================================================================== ERROR: testBug1191043 (__main__.BZ2FileTest) ---------------------------------------------------------------------- Traceback (most recent call last): File "../Lib/test/test_bz2.py", line 255, in testBug1191043 lines = bz2f.readlines() RuntimeError: wrong sequence of bz2 library commands used ====================================================================== ERROR: testBug1191043 (__main__.BZ2FileTest) ---------------------------------------------------------------------- Traceback (most recent call last): File "../Lib/test/test_bz2.py", line 47, in tearDown os.unlink(self.filename) OSError: [Errno 13] Permission denied: '@test' ---------------------------------------------------------------------- Ran 33 tests in 5.980s FAILED (errors=2) Traceback (most recent call last): File "../Lib/test/test_bz2.py", line 357, in ? test_main() File "../Lib/test/test_bz2.py", line 353, in test_main FuncTest File "G:\PROJS\PY24\PYTHON\DIST\SRC\lib\test\test_support.py", line 290, in run_unittest run_suite(suite, testclass) File "G:\PROJS\PY24\PYTHON\DIST\SRC\lib\test\test_support.py", line 274, in run_suite raise TestFailed(msg) test.test_support.TestFailed: errors occurred; run in verbose mode for details _________________________________________________________________ Don't just search. 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