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Rather than supporting dev mode directly in the warnings module, this instead adjusts the initialisation code to add an extra 'default' entry to sys.warnoptions when dev mode is enabled. This ensures that dev mode behaves *exactly* as if `-Wdefault` had been passed on the command line, including in the way it interacts with `sys.warnoptions`, and with other command line flags like `-bb`. Fix also bpo-20361: have -b & -bb options take precedence over any other warnings options. Patch written by Nick Coghlan, with minor modifications of Victor Stinner.
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3 changes: 3 additions & 0 deletions
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Misc/NEWS.d/next/Core and Builtins/2017-12-06-20-18-34.bpo-32230.PgGQaB.rst
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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,3 @@ | ||
`-X dev` now injects a ``'default'`` entry into sys.warnoptions, ensuring | ||
that it behaves identically to actually passing ``-Wdefault`` at the command | ||
line. |
4 changes: 4 additions & 0 deletions
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Misc/NEWS.d/next/Core and Builtins/2017-12-07-17-22-30.bpo-20361.zQUmbi.rst
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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,4 @@ | ||
``-b`` and ``-bb`` now inject ``'default::BytesWarning'`` and | ||
``error::BytesWarning`` entries into ``sys.warnoptions``, ensuring that they | ||
take precedence over any other warning filters configured via the ``-W`` | ||
option or the ``PYTHONWARNINGS`` environment variable. |
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