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gh-123609: Clarify usage of standalone `PyBUF_FORMAT` by ZeroIntensity · Pull Request #123778 · python/cpython · GitHub

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gh-123609: Clarify usage of standalone PyBUF_FORMAT #123778

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Merged
encukou merged 6 commits into from
Sep 10, 2024
Conversation 9 Commits 6 Checks 0 Files changed
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gh-123609: Clarify usage of standalone PyBUF_FORMAT #123778

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4e40251
Clarify usage of standalone PyBUF_FORMAT
ZeroIntensity Sep 6, 2024
82f7d21
Update Doc/c-api/buffer.rst
ZeroIntensity Sep 6, 2024
55dfc6b
Try and make the message more user facing.
ZeroIntensity Sep 8, 2024
3aac9bb
Add example to the buffer request types paragraph.
ZeroIntensity Sep 9, 2024
6256646
Update buffer.rst
ZeroIntensity Sep 9, 2024
beee985
Update buffer.rst
ZeroIntensity Sep 9, 2024
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9 changes: 5 additions & 4 deletions Doc/c-api/buffer.rst
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Expand Up @@ -244,7 +244,6 @@ The following fields are not influenced by *flags* and must always be filled in
with the correct values: :c:member:`~Py_buffer.obj`, :c:member:`~Py_buffer.buf`,
:c:member:`~Py_buffer.len`, :c:member:`~Py_buffer.itemsize`, :c:member:`~Py_buffer.ndim`.


readonly, format
~~~~~~~~~~~~~~~~

Expand All @@ -253,7 +252,8 @@ readonly, format
Controls the :c:member:`~Py_buffer.readonly` field. If set, the exporter
MUST provide a writable buffer or else report failure. Otherwise, the
exporter MAY provide either a read-only or writable buffer, but the choice
MUST be consistent for all consumers.
MUST be consistent for all consumers. For example, :c:expr:`PyBUF_SIMPLE | PyBUF_WRITABLE`
can be used to request a simple writable buffer.

.. c:macro:: PyBUF_FORMAT

Expand All @@ -265,8 +265,9 @@ readonly, format
Since :c:macro:`PyBUF_SIMPLE` is defined as 0, :c:macro:`PyBUF_WRITABLE`
can be used as a stand-alone flag to request a simple writable buffer.

:c:macro:`PyBUF_FORMAT` can be \|'d to any of the flags except :c:macro:`PyBUF_SIMPLE`.
The latter already implies format ``B`` (unsigned bytes).
:c:macro:`PyBUF_FORMAT` must be \|'d to any of the flags except :c:macro:`PyBUF_SIMPLE`, because
the latter already implies format ``B`` (unsigned bytes). :c:macro:`!PyBUF_FORMAT` cannot be
used on its own.


shape, strides, suboffsets
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