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gh-144001: Add ignorechars parameter to Base64 decoder #144009

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2657098
gh-144001: Add ignorechars parameter to Base64 decoder
moneebullah25 Jan 18, 2026
c4b6a65
gh-144001: Register ignorechars identifier in global strings
moneebullah25 Jan 18, 2026
c3f3c2b
gh-1440001: Fixed news.d filename
moneebullah25 Jan 18, 2026
2e3421c
📜🤖 Added by blurb_it.
blurb-it[bot] Jan 18, 2026
5cfb7da
gh-144001: removed news entry and blurbed it
moneebullah25 Jan 18, 2026
f8bba19
docs: added documentation
moneebullah25 Jan 20, 2026
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docs: added documentation
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@moneebullah25
moneebullah25 committed Jan 20, 2026
commit f8bba19b027354f9c43e05645564eb7d71900e83
11 changes: 10 additions & 1 deletion Doc/library/base64.rst
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Expand Up @@ -72,7 +72,7 @@ POST request.
Added the *wrapcol* parameter.


.. function:: b64decode(s, altchars=None, validate=False)
.. function:: b64decode(s, altchars=None, validate=False, *, ignorechars=None)

Decode the Base64 encoded :term:`bytes-like object` or ASCII string
*s* and return the decoded :class:`bytes`.
Expand All @@ -90,10 +90,19 @@ POST request.
these non-alphabet characters in the input result in a
:exc:`binascii.Error`.

Optional *ignorechars* must be a :term:`bytes-like object` specifying
characters to ignore during decoding. When provided, only characters in
this set will be silently ignored; other non-base64 characters will cause
a :exc:`binascii.Error`. When ``None`` (the default), the behavior is
controlled by the *validate* parameter.

For more information about the strict base64 check, see :func:`binascii.a2b_base64`

May assert or raise a :exc:`ValueError` if the length of *altchars* is not 2.

.. versionchanged:: next
Added the *ignorechars* parameter.

.. function:: standard_b64encode(s)

Encode :term:`bytes-like object` *s* using the standard Base64 alphabet
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11 changes: 10 additions & 1 deletion Doc/library/binascii.rst
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Expand Up @@ -48,7 +48,7 @@ The :mod:`binascii` module defines the following functions:
Added the *backtick* parameter.


.. function:: a2b_base64(string, /, *, strict_mode=False)
.. function:: a2b_base64(string, /, *, strict_mode=False, ignorechars=None)

Convert a block of base64 data back to binary and return the binary data. More
than one line may be passed at a time.
Expand All @@ -63,9 +63,18 @@ The :mod:`binascii` module defines the following functions:
* Contains no excess data after padding (including excess padding, newlines, etc.).
* Does not start with a padding.

Optional *ignorechars* must be a :term:`bytes-like object` specifying
characters to ignore during decoding. When provided, only characters in
this set will be silently ignored; other non-base64 characters will cause
an error. When ``None`` (the default), all non-base64 characters are
silently ignored (unless *strict_mode* is true).

.. versionchanged:: 3.11
Added the *strict_mode* parameter.

.. versionchanged:: next
Added the *ignorechars* parameter.


.. function:: b2a_base64(data, *, wrapcol=0, newline=True)

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6 changes: 6 additions & 0 deletions Doc/whatsnew/3.15.rst
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Expand Up @@ -444,13 +444,19 @@ base64
* Added the *wrapcol* parameter in :func:`~base64.b64encode`.
(Contributed by Serhiy Storchaka in :gh:`143214`.)

* Added the *ignorechars* parameter in :func:`~base64.b64decode`.
(Contributed by Muneeb Ullah in :gh:`144001`.)


binascii
--------

* Added the *wrapcol* parameter in :func:`~binascii.b2a_base64`.
(Contributed by Serhiy Storchaka in :gh:`143214`.)

* Added the *ignorechars* parameter in :func:`~binascii.a2b_base64`.
(Contributed by Muneeb Ullah in :gh:`144001`.)


calendar
--------
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