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Title: gh-64192: Make `imap()`/`imap_unordered()` in `multiprocessing.pool` actually lazy by obaltian · Pull Request #136871 · python/cpython · GitHub

Open Graph Title: gh-64192: Make `imap()`/`imap_unordered()` in `multiprocessing.pool` actually lazy by obaltian · Pull Request #136871 · python/cpython

X Title: gh-64192: Make `imap()`/`imap_unordered()` in `multiprocessing.pool` actually lazy by obaltian · Pull Request #136871 · python/cpython

Description: Context recap (#64192) Let's consider that we have an input iterable and N = len(iterable). Current multiprocessing.Pool.imap and multiprocessing.Pool.imap_unordered are O(N) in space (unecessarily...

Open Graph Description: Context recap (#64192) Let's consider that we have an input iterable and N = len(iterable). Current multiprocessing.Pool.imap and multiprocessing.Pool.imap_unordered are O(N) in space (unecessa...

X Description: Context recap (#64192) Let's consider that we have an input iterable and N = len(iterable). Current multiprocessing.Pool.imap and multiprocessing.Pool.imap_unordered are O(N) in space (unec...

Opengraph URL: https://github.com/python/cpython/pull/136871

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Add 2 basic ThreadPool.imap() tests w/ and w/o buffersizehttps://github.com/python/cpython/pull/136871/commits/0b6ba419c226eea338ef56cc1e2d1f91199c883b
0b6ba41https://github.com/python/cpython/pull/136871/commits/0b6ba419c226eea338ef56cc1e2d1f91199c883b
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Fix accidental swap in importshttps://github.com/python/cpython/pull/136871/commits/aade15e629ccbeae2d12818b0cf8cfc4e41b39bd
aade15ehttps://github.com/python/cpython/pull/136871/commits/aade15e629ccbeae2d12818b0cf8cfc4e41b39bd
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clear Pool._taskqueue_buffersize_semaphores safelyhttps://github.com/python/cpython/pull/136871/commits/fb38a72056a2b1c1de4ee55e8063c85cadf8fed8
fb38a72https://github.com/python/cpython/pull/136871/commits/fb38a72056a2b1c1de4ee55e8063c85cadf8fed8
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Slightly optimize Pool._taskqueue_buffersize_semaphores terminatehttps://github.com/python/cpython/pull/136871/commits/6ef488b51446f5dd253962cb3f6ace0968649db9
6ef488bhttps://github.com/python/cpython/pull/136871/commits/6ef488b51446f5dd253962cb3f6ace0968649db9
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Rename Pool.imap() buffersize-related testshttps://github.com/python/cpython/pull/136871/commits/1716725d4af6a30a648ef27c02b5d523718f7866
1716725https://github.com/python/cpython/pull/136871/commits/1716725d4af6a30a648ef27c02b5d523718f7866
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Fix typo in IMapIterator.__init__()https://github.com/python/cpython/pull/136871/commits/9b43cd086b38d3d39c9446ad8c0a07524c16d037
9b43cd0https://github.com/python/cpython/pull/136871/commits/9b43cd086b38d3d39c9446ad8c0a07524c16d037
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Add tests for buffersize combinations with other kwargshttps://github.com/python/cpython/pull/136871/commits/2d8934123e563379dc3b1ab578e62beae38c089f
2d89341https://github.com/python/cpython/pull/136871/commits/2d8934123e563379dc3b1ab578e62beae38c089f
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Remove if-branch in _terminate_poolhttps://github.com/python/cpython/pull/136871/commits/9ab27055e3e5d71f8cd967baf0906bc1ecd5eab8
9ab2705https://github.com/python/cpython/pull/136871/commits/9ab27055e3e5d71f8cd967baf0906bc1ecd5eab8
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Add more edge-case tests for imap and imap_unoderedhttps://github.com/python/cpython/pull/136871/commits/a95500340fe193e84a31c13168763737dbb7d4f7
a955003https://github.com/python/cpython/pull/136871/commits/a95500340fe193e84a31c13168763737dbb7d4f7
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Split inf iterable test for imap and imap_unorderedhttps://github.com/python/cpython/pull/136871/commits/80efd6e56ed45aed25211b15fca0ff591c32ac3c
80efd6ehttps://github.com/python/cpython/pull/136871/commits/80efd6e56ed45aed25211b15fca0ff591c32ac3c
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Add doc for buffersize argument of imap and imap_unorderedhttps://github.com/python/cpython/pull/136871/commits/83d69306d1b6d0828c783e8072f4d4baf1ab4cd1
83d6930https://github.com/python/cpython/pull/136871/commits/83d69306d1b6d0828c783e8072f4d4baf1ab4cd1
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add *versionadded* for imap_unorderedhttps://github.com/python/cpython/pull/136871/commits/995ad8c298677e81bdb586ebefa7360fbdfe223e
995ad8chttps://github.com/python/cpython/pull/136871/commits/995ad8c298677e81bdb586ebefa7360fbdfe223e
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Remove ambiguity in buffersize description.https://github.com/python/cpython/pull/136871/commits/3b6ad65b71a93da3a770f6a4c79921aa14457a5c
3b6ad65https://github.com/python/cpython/pull/136871/commits/3b6ad65b71a93da3a770f6a4c79921aa14457a5c
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Set *versionadded* as next in docshttps://github.com/python/cpython/pull/136871/commits/c941c16ddee10614a427e655d71b4974c8468c3d
c941c16https://github.com/python/cpython/pull/136871/commits/c941c16ddee10614a427e655d71b4974c8468c3d
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Add whatsnew entryhttps://github.com/python/cpython/pull/136871/commits/d09e891d2f887691fc0543c4e437b05e26e943d8
d09e891https://github.com/python/cpython/pull/136871/commits/d09e891d2f887691fc0543c4e437b05e26e943d8
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Fix aggreed comments on code formatting/minor refactoringhttps://github.com/python/cpython/pull/136871/commits/9c6d89de5f66308882659fe6f614c3f66ad943e6
9c6d89dhttps://github.com/python/cpython/pull/136871/commits/9c6d89de5f66308882659fe6f614c3f66ad943e6
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Remove imap and imap_unordered body code duplicationhttps://github.com/python/cpython/pull/136871/commits/4550a01bec9470991ce241a397ef5cf199aee3a1
4550a01https://github.com/python/cpython/pull/136871/commits/4550a01bec9470991ce241a397ef5cf199aee3a1
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August 14, 2025 11:52https://github.com/python/cpython/pull/136871#event-19157854053
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Merge branch 'main' into feature/add-buffersize-to-multiprocessinghttps://github.com/python/cpython/pull/136871/commits/77bde4d510388a513b255fb7f88a50529f1d3627
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August 31, 2025 13:08https://github.com/python/cpython/pull/136871#event-19429053339
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Merge branch 'main' into feature/add-buffersize-to-multiprocessinghttps://github.com/python/cpython/pull/136871/commits/aec39fc45a8f07f38b3c9eb8fa4a0e22be70dec1
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