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[3.12] Docs: Add explanation about little/big endian (GH-109841) #115646

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Feb 19, 2024
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[3.12] Docs: Add explanation about little/big endian (GH-109841) #115646

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15 changes: 15 additions & 0 deletions Doc/library/struct.rst
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Expand Up @@ -156,6 +156,21 @@ following table:

If the first character is not one of these, ``'@'`` is assumed.

.. note::

The number 1023 (``0x3ff`` in hexadecimal) has the following byte representations:

* ``03 ff`` in big-endian (``>``)
* ``ff 03`` in little-endian (``<``)

Python example:

>>> import struct
>>> struct.pack('>h', 1023)
b'\x03\xff'
>>> struct.pack('<h', 1023)
b'\xff\x03'

Native byte order is big-endian or little-endian, depending on the
host system. For example, Intel x86, AMD64 (x86-64), and Apple M1 are
little-endian; IBM z and many legacy architectures are big-endian.
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