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gh-48181: Document codecs.charmap_build #135997

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StanFromIreland Jun 26, 2025
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StanFromIreland Jun 26, 2025
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7 changes: 7 additions & 0 deletions Doc/library/codecs.rst
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Expand Up @@ -53,6 +53,13 @@ any codec:
:exc:`UnicodeDecodeError`). Refer to :ref:`codec-base-classes` for more
information on codec error handling.

.. function:: charmap_build(string)

Return a mapping suitable for decoding a custom single-byte encoding.
Given a string *string* of up to 256 characters representing an encoding
table, returns a dictionary mapping character ordinals to byte values.
Raises a :exc:`TypeError` on invalid input.

The full details for each codec can also be looked up directly:

.. function:: lookup(encoding, /)
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