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gh-111389: Add PyHASH_MULTIPLIER constant
- Issue: gh-111389
📚 Documentation preview 📚: https://cpython-previews--119214.org.readthedocs.build/
The private _PyHASH_MULTIPLIER constant was removed in Python 3.13 alpha 1, but had to be reverted since it broke too many projects.
A code search on PyPI top 7,500 projects (2024-03-16) finds 4 projects using it:
- asyncpg (0.29.0)
- numba (0.59.0)
- orjson (3.9.15)
- recordclass (0.21.1)
This makes sense, no harm in this being public even if I think it is odd that anyone uses it.
It's a good prime number to increase to implement good hash function. Using a random number can lead to more collision.
cc @mdickinson
cc @mdickinson
Change seems reasonable to me; the value is potentially useful to have available if you're implementing something complex-like in a C extension and need equality to behave well with respect to Python's complex. (I'll confess that I've never seen this need in practice, but I've seen the equivalent for float hashing, so it doesn't seem like a huge stretch.)
(I'll confess that I've never seen this need in practice
I don't know about the specific case of floating point objects, but the constant is used by at least 4 projects: https://github.com/python/cpython/pull/119214#issuecomment-2120609403
Thanks @vstinner for the PR 🌮🎉.. I'm working now to backport this PR to: 3.13. 🐍🍒⛏🤖 I'm not a witch! I'm not a witch!
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:warning::warning::warning: Buildbot failure :warning::warning::warning:
Hi! The buildbot wasm32-wasi 3.13 has failed when building commit 1177897551066c1e8c394809152614a6483f9ce7.
What do you need to do:
- Don't panic.
- Check the buildbot page in the devguide if you don't know what the buildbots are or how they work.
- Go to the page of the buildbot that failed (https://buildbot.python.org/all/#builders/1502/builds/133) and take a look at the build logs.
- Check if the failure is related to this commit (1177897551066c1e8c394809152614a6483f9ce7) or if it is a false positive.
- If the failure is related to this commit, please, reflect that on the issue and make a new Pull Request with a fix.
You can take a look at the buildbot page here:
https://buildbot.python.org/all/#builders/1502/builds/133
Failed tests:
- test_math
- test_statistics
Summary of the results of the build (if available):
==
Click to see traceback logs
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remote: Total 19 (delta 6), reused 9 (delta 6), pack-reused 1
From https://github.com/python/cpython
* branch 3.13 -> FETCH_HEAD
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Turn off this advice by setting config variable advice.detachedHead to false
HEAD is now at 1177897551 [3.13] gh-111389: Add PyHASH_MULTIPLIER constant (GH-119214) (#119334)
Switched to and reset branch '3.13'
configure: WARNING: no system libmpdecimal found; falling back to bundled libmpdecimal (deprecated and scheduled for removal in Python 3.15)
configure: WARNING: using cross tools not prefixed with host triplet
configure: WARNING: no system libmpdecimal found; falling back to bundled libmpdecimal (deprecated and scheduled for removal in Python 3.15)
In file included from ../../Modules/md5module.c:46:
In file included from ../../Modules/_hacl/Hacl_Hash_MD5.h:35:
In file included from ../../Modules/_hacl/include/krml/types.h:12:
../../Modules/_hacl/include/krml/lowstar_endianness.h:130:11: warning: 'htole32' macro redefined [-Wmacro-redefined]
130 | # define htole32(x) (x)
| ^
/opt/wasi-sdk-21.0/bin/../share/wasi-sysroot/include/endian.h:43:9: note: previous definition is here
43 | #define htole32(x) (uint32_t)(x)
| ^
In file included from ../../Modules/md5module.c:46:
In file included from ../../Modules/_hacl/Hacl_Hash_MD5.h:35:
In file included from ../../Modules/_hacl/include/krml/types.h:12:
../../Modules/_hacl/include/krml/lowstar_endianness.h:131:11: warning: 'le32toh' macro redefined [-Wmacro-redefined]
131 | # define le32toh(x) (x)
| ^
/opt/wasi-sdk-21.0/bin/../share/wasi-sysroot/include/endian.h:44:9: note: previous definition is here
44 | #define le32toh(x) (uint32_t)(x)
| ^
In file included from ../../Modules/md5module.c:46:
In file included from ../../Modules/_hacl/Hacl_Hash_MD5.h:35:
In file included from ../../Modules/_hacl/include/krml/types.h:12:
../../Modules/_hacl/include/krml/lowstar_endianness.h:132:11: warning: 'htobe32' macro redefined [-Wmacro-redefined]
132 | # define htobe32(x) \
| ^
/opt/wasi-sdk-21.0/bin/../share/wasi-sysroot/include/endian.h:37:9: note: previous definition is here
37 | #define htobe32(x) __bswap32(x)
| ^
In file included from ../../Modules/md5module.c:46:
In file included from ../../Modules/_hacl/Hacl_Hash_MD5.h:35:
In file included from ../../Modules/_hacl/include/krml/types.h:12:
../../Modules/_hacl/include/krml/lowstar_endianness.h:138:11: warning: 'be32toh' macro redefined [-Wmacro-redefined]
138 | # define be32toh(x) (htobe32((x)))
| ^
/opt/wasi-sdk-21.0/bin/../share/wasi-sysroot/include/endian.h:38:9: note: previous definition is here
38 | #define be32toh(x) __bswap32(x)
| ^
In file included from ../../Modules/md5module.c:46:
In file included from ../../Modules/_hacl/Hacl_Hash_MD5.h:35:
In file included from ../../Modules/_hacl/include/krml/types.h:12:
../../Modules/_hacl/include/krml/lowstar_endianness.h:140:11: warning: 'htole64' macro redefined [-Wmacro-redefined]
140 | # define htole64(x) (x)
| ^
/opt/wasi-sdk-21.0/bin/../share/wasi-sysroot/include/endian.h:45:9: note: previous definition is here
45 | #define htole64(x) (uint64_t)(x)
| ^
In file included from ../../Modules/md5module.c:46:
In file included from ../../Modules/_hacl/Hacl_Hash_MD5.h:35:
In file included from ../../Modules/_hacl/include/krml/types.h:12:
../../Modules/_hacl/include/krml/lowstar_endianness.h:141:11: warning: 'le64toh' macro redefined [-Wmacro-redefined]
141 | # define le64toh(x) (x)
| ^
/opt/wasi-sdk-21.0/bin/../share/wasi-sysroot/include/endian.h:46:9: note: previous definition is here
46 | #define le64toh(x) (uint64_t)(x)
| ^
In file included from ../../Modules/md5module.c:46:
In file included from ../../Modules/_hacl/Hacl_Hash_MD5.h:35:
In file included from ../../Modules/_hacl/include/krml/types.h:12:
../../Modules/_hacl/include/krml/lowstar_endianness.h:142:11: warning: 'htobe64' macro redefined [-Wmacro-redefined]
142 | # define htobe64(x) \
| ^
/opt/wasi-sdk-21.0/bin/../share/wasi-sysroot/include/endian.h:39:9: note: previous definition is here
39 | #define htobe64(x) __bswap64(x)
| ^
In file included from ../../Modules/md5module.c:46:
In file included from ../../Modules/_hacl/Hacl_Hash_MD5.h:35:
In file included from ../../Modules/_hacl/include/krml/types.h:12:
../../Modules/_hacl/include/krml/lowstar_endianness.h:149:11: warning: 'be64toh' macro redefined [-Wmacro-redefined]
149 | # define be64toh(x) (htobe64((x)))
| ^
/opt/wasi-sdk-21.0/bin/../share/wasi-sysroot/include/endian.h:40:9: note: previous definition is here
40 | #define be64toh(x) __bswap64(x)
| ^
8 warnings generated.
In file included from ../../Modules/sha1module.c:47:
In file included from ../../Modules/_hacl/Hacl_Hash_SHA1.h:35:
In file included from ../../Modules/_hacl/include/krml/types.h:12:
../../Modules/_hacl/include/krml/lowstar_endianness.h:130:11: warning: 'htole32' macro redefined [-Wmacro-redefined]
130 | # define htole32(x) (x)
| ^
/opt/wasi-sdk-21.0/bin/../share/wasi-sysroot/include/endian.h:43:9: note: previous definition is here
43 | #define htole32(x) (uint32_t)(x)
| ^
In file included from ../../Modules/sha1module.c:47:
In file included from ../../Modules/_hacl/Hacl_Hash_SHA1.h:35:
In file included from ../../Modules/_hacl/include/krml/types.h:12:
../../Modules/_hacl/include/krml/lowstar_endianness.h:131:11: warning: 'le32toh' macro redefined [-Wmacro-redefined]
131 | # define le32toh(x) (x)
| ^
/opt/wasi-sdk-21.0/bin/../share/wasi-sysroot/include/endian.h:44:9: note: previous definition is here
44 | #define le32toh(x) (uint32_t)(x)
| ^
In file included from ../../Modules/sha1module.c:47:
In file included from ../../Modules/_hacl/Hacl_Hash_SHA1.h:35:
In file included from ../../Modules/_hacl/include/krml/types.h:12:
../../Modules/_hacl/include/krml/lowstar_endianness.h:132:11: warning: 'htobe32' macro redefined [-Wmacro-redefined]
132 | # define htobe32(x) \
| ^
/opt/wasi-sdk-21.0/bin/../share/wasi-sysroot/include/endian.h:37:9: note: previous definition is here
37 | #define htobe32(x) __bswap32(x)
| ^
In file included from ../../Modules/sha1module.c:47:
In file included from ../../Modules/_hacl/Hacl_Hash_SHA1.h:35:
In file included from ../../Modules/_hacl/include/krml/types.h:12:
../../Modules/_hacl/include/krml/lowstar_endianness.h:138:11: warning: 'be32toh' macro redefined [-Wmacro-redefined]
138 | # define be32toh(x) (htobe32((x)))
| ^
/opt/wasi-sdk-21.0/bin/../share/wasi-sysroot/include/endian.h:38:9: note: previous definition is here
38 | #define be32toh(x) __bswap32(x)
| ^
In file included from ../../Modules/sha1module.c:47:
In file included from ../../Modules/_hacl/Hacl_Hash_SHA1.h:35:
In file included from ../../Modules/_hacl/include/krml/types.h:12:
../../Modules/_hacl/include/krml/lowstar_endianness.h:140:11: warning: 'htole64' macro redefined [-Wmacro-redefined]
140 | # define htole64(x) (x)
| ^
/opt/wasi-sdk-21.0/bin/../share/wasi-sysroot/include/endian.h:45:9: note: previous definition is here
45 | #define htole64(x) (uint64_t)(x)
| ^
In file included from ../../Modules/sha1module.c:47:
In file included from ../../Modules/_hacl/Hacl_Hash_SHA1.h:35:
In file included from ../../Modules/_hacl/include/krml/types.h:12:
../../Modules/_hacl/include/krml/lowstar_endianness.h:141:11: warning: 'le64toh' macro redefined [-Wmacro-redefined]
141 | # define le64toh(x) (x)
| ^
/opt/wasi-sdk-21.0/bin/../share/wasi-sysroot/include/endian.h:46:9: note: previous definition is here
46 | #define le64toh(x) (uint64_t)(x)
| ^
In file included from ../../Modules/sha1module.c:47:
In file included from ../../Modules/_hacl/Hacl_Hash_SHA1.h:35:
In file included from ../../Modules/_hacl/include/krml/types.h:12:
../../Modules/_hacl/include/krml/lowstar_endianness.h:142:11: warning: 'htobe64' macro redefined [-Wmacro-redefined]
142 | # define htobe64(x) \
| ^
/opt/wasi-sdk-21.0/bin/../share/wasi-sysroot/include/endian.h:39:9: note: previous definition is here
39 | #define htobe64(x) __bswap64(x)
| ^
In file included from ../../Modules/sha1module.c:47:
In file included from ../../Modules/_hacl/Hacl_Hash_SHA1.h:35:
In file included from ../../Modules/_hacl/include/krml/types.h:12:
../../Modules/_hacl/include/krml/lowstar_endianness.h:149:11: warning: 'be64toh' macro redefined [-Wmacro-redefined]
149 | # define be64toh(x) (htobe64((x)))
| ^
/opt/wasi-sdk-21.0/bin/../share/wasi-sysroot/include/endian.h:40:9: note: previous definition is here
40 | #define be64toh(x) __bswap64(x)
| ^
8 warnings generated.
In file included from ../../Modules/sha3module.c:59:
In file included from ../../Modules/_hacl/Hacl_Hash_SHA3.h:35:
In file included from ../../Modules/_hacl/include/krml/types.h:12:
../../Modules/_hacl/include/krml/lowstar_endianness.h:130:11: warning: 'htole32' macro redefined [-Wmacro-redefined]
130 | # define htole32(x) (x)
| ^
/opt/wasi-sdk-21.0/bin/../share/wasi-sysroot/include/endian.h:43:9: note: previous definition is here
43 | #define htole32(x) (uint32_t)(x)
| ^
In file included from ../../Modules/sha3module.c:59:
In file included from ../../Modules/_hacl/Hacl_Hash_SHA3.h:35:
In file included from ../../Modules/_hacl/include/krml/types.h:12:
../../Modules/_hacl/include/krml/lowstar_endianness.h:131:11: warning: 'le32toh' macro redefined [-Wmacro-redefined]
131 | # define le32toh(x) (x)
| ^
/opt/wasi-sdk-21.0/bin/../share/wasi-sysroot/include/endian.h:44:9: note: previous definition is here
44 | #define le32toh(x) (uint32_t)(x)
| ^
In file included from ../../Modules/sha3module.c:59:
In file included from ../../Modules/_hacl/Hacl_Hash_SHA3.h:35:
In file included from ../../Modules/_hacl/include/krml/types.h:12:
../../Modules/_hacl/include/krml/lowstar_endianness.h:132:11: warning: 'htobe32' macro redefined [-Wmacro-redefined]
132 | # define htobe32(x) \
| ^
/opt/wasi-sdk-21.0/bin/../share/wasi-sysroot/include/endian.h:37:9: note: previous definition is here
37 | #define htobe32(x) __bswap32(x)
| ^
In file included from ../../Modules/sha3module.c:59:
In file included from ../../Modules/_hacl/Hacl_Hash_SHA3.h:35:
In file included from ../../Modules/_hacl/include/krml/types.h:12:
../../Modules/_hacl/include/krml/lowstar_endianness.h:138:11: warning: 'be32toh' macro redefined [-Wmacro-redefined]
138 | # define be32toh(x) (htobe32((x)))
| ^
/opt/wasi-sdk-21.0/bin/../share/wasi-sysroot/include/endian.h:38:9: note: previous definition is here
38 | #define be32toh(x) __bswap32(x)
| ^
In file included from ../../Modules/sha3module.c:59:
In file included from ../../Modules/_hacl/Hacl_Hash_SHA3.h:35:
In file included from ../../Modules/_hacl/include/krml/types.h:12:
../../Modules/_hacl/include/krml/lowstar_endianness.h:140:11: warning: 'htole64' macro redefined [-Wmacro-redefined]
140 | # define htole64(x) (x)
| ^
/opt/wasi-sdk-21.0/bin/../share/wasi-sysroot/include/endian.h:45:9: note: previous definition is here
45 | #define htole64(x) (uint64_t)(x)
| ^
In file included from ../../Modules/sha3module.c:59:
In file included from ../../Modules/_hacl/Hacl_Hash_SHA3.h:35:
In file included from ../../Modules/_hacl/include/krml/types.h:12:
../../Modules/_hacl/include/krml/lowstar_endianness.h:141:11: warning: 'le64toh' macro redefined [-Wmacro-redefined]
141 | # define le64toh(x) (x)
| ^
/opt/wasi-sdk-21.0/bin/../share/wasi-sysroot/include/endian.h:46:9: note: previous definition is here
46 | #define le64toh(x) (uint64_t)(x)
| ^
In file included from ../../Modules/sha3module.c:59:
In file included from ../../Modules/_hacl/Hacl_Hash_SHA3.h:35:
In file included from ../../Modules/_hacl/include/krml/types.h:12:
../../Modules/_hacl/include/krml/lowstar_endianness.h:142:11: warning: 'htobe64' macro redefined [-Wmacro-redefined]
142 | # define htobe64(x) \
| ^
/opt/wasi-sdk-21.0/bin/../share/wasi-sysroot/include/endian.h:39:9: note: previous definition is here
39 | #define htobe64(x) __bswap64(x)
| ^
In file included from ../../Modules/sha3module.c:59:
In file included from ../../Modules/_hacl/Hacl_Hash_SHA3.h:35:
In file included from ../../Modules/_hacl/include/krml/types.h:12:
../../Modules/_hacl/include/krml/lowstar_endianness.h:149:11: warning: 'be64toh' macro redefined [-Wmacro-redefined]
149 | # define be64toh(x) (htobe64((x)))
| ^
/opt/wasi-sdk-21.0/bin/../share/wasi-sysroot/include/endian.h:40:9: note: previous definition is here
40 | #define be64toh(x) __bswap64(x)
| ^
8 warnings generated.
../../Modules/expat/xmlparse.c:7839:11: warning: format specifies type 'int' but the argument has type 'ptrdiff_t' (aka 'long') [-Wformat]
7838 | " (+" EXPAT_FMT_PTRDIFF_T("6") " bytes %s|%d, xmlparse.c:%d) %*s\"",
| ~~~~~~~~~~~~~~~~~~~~~~~~
7839 | bytesMore, (account == XML_ACCOUNT_DIRECT) ? "DIR" : "EXP",
| ^~~~~~~~~
1 warning generated.
../../Modules/_testinternalcapi/test_critical_sections.c:142:1: warning: unused function 'thread_critical_sections' [-Wunused-function]
142 | thread_critical_sections(void *arg)
| ^~~~~~~~~~~~~~~~~~~~~~~~
1 warning generated.
../../Modules/posixmodule.c:7859:1: warning: unused function 'warn_about_fork_with_threads' [-Wunused-function]
7859 | warn_about_fork_with_threads(const char* name)
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
1 warning generated.
In file included from ../../Modules/sha2module.c:48:
In file included from ../../Modules/_hacl/Hacl_Hash_SHA2.h:35:
In file included from ../../Modules/_hacl/include/krml/types.h:12:
../../Modules/_hacl/include/krml/lowstar_endianness.h:130:11: warning: 'htole32' macro redefined [-Wmacro-redefined]
130 | # define htole32(x) (x)
| ^
/opt/wasi-sdk-21.0/bin/../share/wasi-sysroot/include/endian.h:43:9: note: previous definition is here
43 | #define htole32(x) (uint32_t)(x)
| ^
In file included from ../../Modules/sha2module.c:48:
In file included from ../../Modules/_hacl/Hacl_Hash_SHA2.h:35:
In file included from ../../Modules/_hacl/include/krml/types.h:12:
../../Modules/_hacl/include/krml/lowstar_endianness.h:131:11: warning: 'le32toh' macro redefined [-Wmacro-redefined]
131 | # define le32toh(x) (x)
| ^
/opt/wasi-sdk-21.0/bin/../share/wasi-sysroot/include/endian.h:44:9: note: previous definition is here
44 | #define le32toh(x) (uint32_t)(x)
| ^
In file included from ../../Modules/sha2module.c:48:
In file included from ../../Modules/_hacl/Hacl_Hash_SHA2.h:35:
In file included from ../../Modules/_hacl/include/krml/types.h:12:
../../Modules/_hacl/include/krml/lowstar_endianness.h:132:11: warning: 'htobe32' macro redefined [-Wmacro-redefined]
132 | # define htobe32(x) \
| ^
/opt/wasi-sdk-21.0/bin/../share/wasi-sysroot/include/endian.h:37:9: note: previous definition is here
37 | #define htobe32(x) __bswap32(x)
| ^
In file included from ../../Modules/sha2module.c:48:
In file included from ../../Modules/_hacl/Hacl_Hash_SHA2.h:35:
In file included from ../../Modules/_hacl/include/krml/types.h:12:
../../Modules/_hacl/include/krml/lowstar_endianness.h:138:11: warning: 'be32toh' macro redefined [-Wmacro-redefined]
138 | # define be32toh(x) (htobe32((x)))
| ^
/opt/wasi-sdk-21.0/bin/../share/wasi-sysroot/include/endian.h:38:9: note: previous definition is here
38 | #define be32toh(x) __bswap32(x)
| ^
In file included from ../../Modules/sha2module.c:48:
In file included from ../../Modules/_hacl/Hacl_Hash_SHA2.h:35:
In file included from ../../Modules/_hacl/include/krml/types.h:12:
../../Modules/_hacl/include/krml/lowstar_endianness.h:140:11: warning: 'htole64' macro redefined [-Wmacro-redefined]
140 | # define htole64(x) (x)
| ^
/opt/wasi-sdk-21.0/bin/../share/wasi-sysroot/include/endian.h:45:9: note: previous definition is here
45 | #define htole64(x) (uint64_t)(x)
| ^
In file included from ../../Modules/sha2module.c:48:
In file included from ../../Modules/_hacl/Hacl_Hash_SHA2.h:35:
In file included from ../../Modules/_hacl/include/krml/types.h:12:
../../Modules/_hacl/include/krml/lowstar_endianness.h:141:11: warning: 'le64toh' macro redefined [-Wmacro-redefined]
141 | # define le64toh(x) (x)
| ^
/opt/wasi-sdk-21.0/bin/../share/wasi-sysroot/include/endian.h:46:9: note: previous definition is here
46 | #define le64toh(x) (uint64_t)(x)
| ^
In file included from ../../Modules/sha2module.c:48:
In file included from ../../Modules/_hacl/Hacl_Hash_SHA2.h:35:
In file included from ../../Modules/_hacl/include/krml/types.h:12:
../../Modules/_hacl/include/krml/lowstar_endianness.h:142:11: warning: 'htobe64' macro redefined [-Wmacro-redefined]
142 | # define htobe64(x) \
| ^
/opt/wasi-sdk-21.0/bin/../share/wasi-sysroot/include/endian.h:39:9: note: previous definition is here
39 | #define htobe64(x) __bswap64(x)
| ^
In file included from ../../Modules/sha2module.c:48:
In file included from ../../Modules/_hacl/Hacl_Hash_SHA2.h:35:
In file included from ../../Modules/_hacl/include/krml/types.h:12:
../../Modules/_hacl/include/krml/lowstar_endianness.h:149:11: warning: 'be64toh' macro redefined [-Wmacro-redefined]
149 | # define be64toh(x) (htobe64((x)))
| ^
/opt/wasi-sdk-21.0/bin/../share/wasi-sysroot/include/endian.h:40:9: note: previous definition is here
40 | #define be64toh(x) __bswap64(x)
| ^
8 warnings generated.
Kill <WorkerThread #1 running test=test_math pid=2536312 time=25 min> process group
Kill <WorkerThread #1 running test=test_statistics pid=2552347 time=25 min> process group
make: *** [Makefile:2210: buildbottest] Error 2
Cannot open file '/home/buildbot/buildarea/3.13.bcannon-wasi.wasi.debug/build/build/cross-build/wasm32-wasi/test-results.xml' for upload
