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Title: gh-143715: Deprecate incomplete initialization of struct.Struct() by serhiy-storchaka · Pull Request #145580 · python/cpython · GitHub

Open Graph Title: gh-143715: Deprecate incomplete initialization of struct.Struct() by serhiy-storchaka · Pull Request #145580 · python/cpython

X Title: gh-143715: Deprecate incomplete initialization of struct.Struct() by serhiy-storchaka · Pull Request #145580 · python/cpython

Description: The Python programming language. Contribute to python/cpython development by creating an account on GitHub.

Open Graph Description: Struct.__new__() will require a mandatory argument (format) Calls of __init__() method on initialized Struct are deprecated This is an evolution of #143659, but since virtually all code and test w...

X Description: Struct.__new__() will require a mandatory argument (format) Calls of __init__() method on initialized Struct are deprecated This is an evolution of #143659, but since virtually all code and test w...

Opengraph URL: https://github.com/python/cpython/pull/145580

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gh-143715: Deprecate incomplete initialization of struct.Struct()https://github.com/python/cpython/pull/145580#top
serhiy-storchakahttps://github.com/serhiy-storchaka
python:mainhttps://github.com/python/cpython/tree/main
serhiy-storchaka:deprecate-struct-inithttps://github.com/serhiy-storchaka/cpython/tree/deprecate-struct-init
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Mar 6, 2026https://github.com/python/cpython/pull/145580#issue-4033066403
Please reload this pagehttps://github.com/python/cpython/pull/145580
#143659https://github.com/python/cpython/pull/143659
Make struct.Struct() really immutable #143715https://github.com/python/cpython/issues/143715
https://cpython-previews--145580.org.readthedocs.build/https://cpython-previews--145580.org.readthedocs.build/
Please reload this pagehttps://github.com/python/cpython/pull/145580
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January 10, 2026 16:37https://github.com/python/cpython/pull/145580#commits-pushed-fff147f
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pythongh-78724https://github.com/python/cpython/issues/78724
: deprecate incomplete initialization of struct.Struct()https://github.com/python/cpython/pull/145580/commits/fff147fca41c25cba10655cfab0de0b7f64f6430
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Merge branch 'master' into deprecate-struct-init-2/78724https://github.com/python/cpython/pull/145580/commits/d2a03451b90ee30a3839982d24452dc4d4a535e3
d2a0345https://github.com/python/cpython/pull/145580/commits/d2a03451b90ee30a3839982d24452dc4d4a535e3
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address review: test_Struct_reinitialization()https://github.com/python/cpython/pull/145580/commits/589fbc74b91d352b41c79ed31f1e0dd0fc2b3be4
589fbc7https://github.com/python/cpython/pull/145580/commits/589fbc74b91d352b41c79ed31f1e0dd0fc2b3be4
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catch new warning in test_operations_on_half_initialized_Struct()https://github.com/python/cpython/pull/145580/commits/5e91e878df50a4ee3a14cbf44a5b9db04edf5da5
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add init_called flaghttps://github.com/python/cpython/pull/145580/commits/babb274bfe004bdaed46c2437a5e1ab25aa1842a
babb274https://github.com/python/cpython/pull/145580/commits/babb274bfe004bdaed46c2437a5e1ab25aa1842a
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Merge branch 'master' into deprecate-struct-init-2/78724https://github.com/python/cpython/pull/145580/commits/0e4e84b48f206469aba9d86d83bb0c0f4f9f4f2e
0e4e84bhttps://github.com/python/cpython/pull/145580/commits/0e4e84b48f206469aba9d86d83bb0c0f4f9f4f2e
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a hack to support new idiom for subclassinghttps://github.com/python/cpython/pull/145580/commits/3f36635ca862290a0a28cc5e7c0066772165cc5d
3f36635https://github.com/python/cpython/pull/145580/commits/3f36635ca862290a0a28cc5e7c0066772165cc5d
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Merge branch 'master' into deprecate-struct-init-2/78724https://github.com/python/cpython/pull/145580/commits/e576475b69c68f0a912374512a7a58ac4020cf6e
e576475https://github.com/python/cpython/pull/145580/commits/e576475b69c68f0a912374512a7a58ac4020cf6e
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+ filter out Struct signature testhttps://github.com/python/cpython/pull/145580/commits/628aadd9713644870a9861be2a5fe5c555a6beab
628aaddhttps://github.com/python/cpython/pull/145580/commits/628aadd9713644870a9861be2a5fe5c555a6beab
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Update Modules/_struct.chttps://github.com/python/cpython/pull/145580/commits/979cc18bb183bf9a8ab90260801e1cde7de20048
979cc18https://github.com/python/cpython/pull/145580/commits/979cc18bb183bf9a8ab90260801e1cde7de20048
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Merge branch 'master' into deprecate-struct-init-2/78724https://github.com/python/cpython/pull/145580/commits/f7492ecc08be771969953f7a857410f2ee72f537
f7492echttps://github.com/python/cpython/pull/145580/commits/f7492ecc08be771969953f7a857410f2ee72f537
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address review: reformat s_new()https://github.com/python/cpython/pull/145580/commits/db8f5f25b02039238ce1f5fb07330902609bc618
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address review: actual___init___impl -> s_inithttps://github.com/python/cpython/pull/145580/commits/dc8cbefa50c08405ac2fb9a768512e7491dce4ab
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Merge branch 'master' into deprecate-struct-init-2/78724https://github.com/python/cpython/pull/145580/commits/6206ae10c0a020a69069a5cbf8d90eca9dbc1cd3
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Update Doc/deprecations/pending-removal-in-3.20.rsthttps://github.com/python/cpython/pull/145580/commits/12143d13f84e89f79c97702b359d026dc6c8f006
12143d1https://github.com/python/cpython/pull/145580/commits/12143d13f84e89f79c97702b359d026dc6c8f006
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Merge branch 'master' into deprecate-struct-init-2/78724https://github.com/python/cpython/pull/145580/commits/d4ca6b84e900d01beac884334422fc243290d8d0
d4ca6b8https://github.com/python/cpython/pull/145580/commits/d4ca6b84e900d01beac884334422fc243290d8d0
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+ rename newshttps://github.com/python/cpython/pull/145580/commits/6b9b4fb501a0f333c60eed8e5b9ba5af7be353c4
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Apply suggestions from code reviewhttps://github.com/python/cpython/pull/145580/commits/79961a2e871854aa385b5694739a65c56148e5c6
79961a2https://github.com/python/cpython/pull/145580/commits/79961a2e871854aa385b5694739a65c56148e5c6
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address review: add testhttps://github.com/python/cpython/pull/145580/commits/58550c0eba68361268fdac5a2ab21ee2b01878d0
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address review: fix for formathttps://github.com/python/cpython/pull/145580/commits/c815882904899f7d409a5bf02c1548640c2cf16d
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address review: reformat if blockshttps://github.com/python/cpython/pull/145580/commits/f1388ee2e7acce6a46933f321eb896909e8ad628
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address review: s_newhttps://github.com/python/cpython/pull/145580/commits/685a6c41257bad6cb87113c57e62d21623aff663
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Merge branch 'master' into deprecate-struct-init-2/78724https://github.com/python/cpython/pull/145580/commits/76f8723a97120073f7329bbeadec5ec3feea9943
76f8723https://github.com/python/cpython/pull/145580/commits/76f8723a97120073f7329bbeadec5ec3feea9943
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address review: add fake signature for Structhttps://github.com/python/cpython/pull/145580/commits/538d3013a55ffee69e892adf1f8c0d724ee0618d
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+test new idiomhttps://github.com/python/cpython/pull/145580/commits/09d6ebdc930d39561eddd7a61adfe5cab361cf88
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Some cleanup; also add reference to issue and reverted PRhttps://github.com/python/cpython/pull/145580/commits/7f0a1330c39b9794aabb8b0c091b950b06d69281
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Merge branch 'master' into deprecate-struct-init-2/78724https://github.com/python/cpython/pull/145580/commits/26cde894790c678a875034c2f10b2a119990191e
26cde89https://github.com/python/cpython/pull/145580/commits/26cde894790c678a875034c2f10b2a119990191e
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issue DeprecationWarning for implicit tp_new calls in subclasseshttps://github.com/python/cpython/pull/145580/commits/76978206ea0358ac52e7c7860581ee60e073525f
7697820https://github.com/python/cpython/pull/145580/commits/76978206ea0358ac52e7c7860581ee60e073525f
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Fix more corner cases.https://github.com/python/cpython/pull/145580/commits/05eb292fb30d946409a8b8bbbed754378b5d80b2
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Make struct.Struct() really immutable #143715 https://github.com/python/cpython/issues/143715
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Doc/deprecations/pending-removal-in-3.20.rsthttps://github.com/python/cpython/pull/145580/files/05eb292fb30d946409a8b8bbbed754378b5d80b2#diff-2888a96b9d5084ea7843198342cec3672d2b3154876f4ac0360cc525d5fae694
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Add assertions for format.https://github.com/python/cpython/pull/145580/commits/e003dab66580fda281f7a1b1963161af2252dc81
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