Hi, Martin. I replied your last comment and your patch looks good to me except one test fails:[1/1] test_zlibtest_abcdefghijklmnop (test.test_zlib.ChecksumTestCase)testissue1202 compliance: signed crc32, adler32 in 2.x ... oktest_adler32empty (test.test_zlib.ChecksumTestCase) ... oktest_adler32start (test.test_zlib.ChecksumTestCase) ... oktest_crc32empty (test.test_zlib.ChecksumTestCase) ... oktest_crc32start (test.test_zlib.ChecksumTestCase) ... oktest_negative_crc_iv_input (test.test_zlib.ChecksumTestCase) ... oktest_penguins (test.test_zlib.ChecksumTestCase) ... oktest_same_as_binascii_crc32 (test.test_zlib.ChecksumTestCase) ... oktest_big_buffer (test.test_zlib.ChecksumBigBufferTestCase) ... ERRORtest_badcompressobj (test.test_zlib.ExceptionTestCase) ... oktest_baddecompressobj (test.test_zlib.ExceptionTestCase) ... oktest_badlevel (test.test_zlib.ExceptionTestCase) ... oktest_decompressobj_badflush (test.test_zlib.ExceptionTestCase) ... oktest_overflow (test.test_zlib.ExceptionTestCase) ... oktest_64bit_compress (test.test_zlib.CompressTestCase) ... oktest_big_compress_buffer (test.test_zlib.CompressTestCase) ... oktest_big_decompress_buffer (test.test_zlib.CompressTestCase) ... oktest_custom_bufsize (test.test_zlib.CompressTestCase) ... oktest_incomplete_stream (test.test_zlib.CompressTestCase) ... oktest_large_bufsize (test.test_zlib.CompressTestCase) ... oktest_speech (test.test_zlib.CompressTestCase) ... oktest_speech128 (test.test_zlib.CompressTestCase) ... oktest_64bit_compress (test.test_zlib.CompressObjectTestCase) ... oktest_badcompresscopy (test.test_zlib.CompressObjectTestCase) ... oktest_baddecompresscopy (test.test_zlib.CompressObjectTestCase) ... oktest_big_compress_buffer (test.test_zlib.CompressObjectTestCase) ... oktest_big_decompress_buffer (test.test_zlib.CompressObjectTestCase) ... oktest_clear_unconsumed_tail (test.test_zlib.CompressObjectTestCase) ... oktest_compresscopy (test.test_zlib.CompressObjectTestCase) ... oktest_compressincremental (test.test_zlib.CompressObjectTestCase) ... oktest_compressoptions (test.test_zlib.CompressObjectTestCase) ... oktest_compresspickle (test.test_zlib.CompressObjectTestCase) ... oktest_decompimax (test.test_zlib.CompressObjectTestCase) ... oktest_decompinc (test.test_zlib.CompressObjectTestCase) ... oktest_decompincflush (test.test_zlib.CompressObjectTestCase) ... oktest_decompress_incomplete_stream (test.test_zlib.CompressObjectTestCase) ... oktest_decompress_unused_data (test.test_zlib.CompressObjectTestCase) ... oktest_decompresscopy (test.test_zlib.CompressObjectTestCase) ... oktest_decompressmaxlen (test.test_zlib.CompressObjectTestCase) ... oktest_decompressmaxlenflush (test.test_zlib.CompressObjectTestCase) ... oktest_decompresspickle (test.test_zlib.CompressObjectTestCase) ... oktest_empty_flush (test.test_zlib.CompressObjectTestCase) ... oktest_flush_custom_length (test.test_zlib.CompressObjectTestCase) ... oktest_flush_large_length (test.test_zlib.CompressObjectTestCase) ... oktest_flush_with_freed_input (test.test_zlib.CompressObjectTestCase) ... oktest_flushes (test.test_zlib.CompressObjectTestCase) ... oktest_large_unconsumed_tail (test.test_zlib.CompressObjectTestCase) ... oktest_large_unused_data (test.test_zlib.CompressObjectTestCase) ... oktest_maxlen_custom (test.test_zlib.CompressObjectTestCase) ... oktest_maxlen_large (test.test_zlib.CompressObjectTestCase) ... oktest_maxlenmisc (test.test_zlib.CompressObjectTestCase) ... oktest_odd_flush (test.test_zlib.CompressObjectTestCase) ... oktest_pair (test.test_zlib.CompressObjectTestCase) ... oktest_wbits (test.test_zlib.CompressObjectTestCase) ... ok======================================================================ERROR: test_big_buffer (test.test_zlib.ChecksumBigBufferTestCase)----------------------------------------------------------------------Traceback (most recent call last):  File "/usr/home/zhangxiang3/Python-2.7.12/Lib/test/test_support.py", line 1348, in wrapper    return f(self, maxsize)  File "/usr/home/zhangxiang3/Python-2.7.12/Lib/test/test_zlib.py", line 90, in test_big_buffer    ChecksumTestCase.assertEqual32(self, zlib.crc32(data),1044521549)TypeError: unbound method assertEqual32() must be called with ChecksumTestCase instance as first argument (got ChecksumBigBufferTestCase instance instead)----------------------------------------------------------------------Ran 54 tests in 317.008sFAILED (errors=1)test test_zlib failed -- Traceback (most recent call last):  File "/usr/home/zhangxiang3/Python-2.7.12/Lib/test/test_support.py", line 1348, in wrapper    return f(self, maxsize)  File "/usr/home/zhangxiang3/Python-2.7.12/Lib/test/test_zlib.py", line 90, in test_big_buffer    ChecksumTestCase.assertEqual32(self, zlib.crc32(data),1044521549)TypeError: unbound method assertEqual32() must be called with ChecksumTestCase instance as first argument (got ChecksumBigBufferTestCase instance instead)1 test failed:    test_zlib