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ncoghlan merged 1 commit into from
Nov 5, 2017
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bpo-22257: Mention startup refactoring in What's New #4286

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bpo-22257: Mention startup refactoring in What's New 
While technically a purely internal change, bpo-31845 was
a fairly significant externally visible bug caused by
these changes (environment variable based configuration
was being ignored due to a change in the relative order
of reading the environment and reading command line settings,
and the test suite was only testing the command line options)

Hence this note to essentially say "If you see odd startup
problems in 3.7 that you've never seen in previous releases,
it's probably our fault, so let us know, and we'll fix it".
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@ncoghlan
ncoghlan committed Nov 5, 2017
commit 848b0661a43f1b6a59ec8921c23c7f01d7710ea3
14 changes: 14 additions & 0 deletions Doc/whatsnew/3.7.rst
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Expand Up @@ -686,6 +686,20 @@ CPython bytecode changes
(Contributed by Yury Selivanov and INADA Naoki in :issue:`26110`.)


Other CPython implementation changes
------------------------------------

* In preparation for potential future changes to the public CPython runtime
initialization API (see :pep:`432` for details), CPython's internal startup
and configuration management logic has been significantly refactored. While
these updates are intended to be entirely transparent to both embedding
applications and users of the regular CPython CLI, they're being mentioned
here as the refactoring changes the internal order of various operations
during interpreter startup, and hence may uncover previously latent defects,
either in embedding applications, or in CPython itself.
(Contributed by Nick Coghlan and Eric Snow as part of :issue:`22257`.)


Documentation
=============

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