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gh-73613: clarify padding= docs in for base64 & binascii modules by gpshead · Pull Request #148183 · python/cpython · GitHub

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gh-73613: clarify padding= docs in for base64 & binascii modules #148183

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Merged
gpshead merged 1 commit into from
Apr 6, 2026
+14 −6
Conversation 0 Commits 1 Checks 35 Files changed 2
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gh-73613: clarify padding= docs in for base64 & binascii modules #148183

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13 changes: 9 additions & 4 deletions Doc/library/base64.rst
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Expand Up @@ -85,8 +85,11 @@ POST request.

If *padded* is true, the last group of 4 base 64 alphabet characters must
be padded with the '=' character.
If *padded* is false, the '=' character is treated as other non-alphabet
characters (depending on the value of *validate* and *ignorechars*).
If *padded* is false, padding is neither required nor recognized:
the '=' character is not treated as padding but as a non-alphabet
character, which means it is silently discarded when *validate* is false,
or causes an :exc:`~binascii.Error` when *validate* is true unless
b'=' is included in *ignorechars*.

A :exc:`binascii.Error` exception is raised
if *s* is incorrectly padded.
Expand Down Expand Up @@ -194,8 +197,10 @@ POST request.

If *padded* is true, the last group of 8 base 32 alphabet characters must
be padded with the '=' character.
If *padded* is false, the '=' character is treated as other non-alphabet
characters (depending on the value of *ignorechars*).
If *padded* is false, padding is neither required nor recognized:
the '=' character is not treated as padding but as a non-alphabet
character, which means it raises an :exc:`~binascii.Error` unless
b'=' is included in *ignorechars*.

*ignorechars* should be a :term:`bytes-like object` containing characters
to ignore from the input.
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7 changes: 5 additions & 2 deletions Doc/library/binascii.rst
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Expand Up @@ -59,8 +59,11 @@ The :mod:`!binascii` module defines the following functions:

If *padded* is true, the last group of 4 base 64 alphabet characters must
be padded with the '=' character.
If *padded* is false, the '=' character is treated as other non-alphabet
characters (depending on the value of *strict_mode* and *ignorechars*).
If *padded* is false, padding is neither required nor recognized:
the '=' character is not treated as padding but as a non-alphabet
character, which means it is silently discarded when *strict_mode* is false,
or causes an :exc:`~binascii.Error` when *strict_mode* is true unless
b'=' is included in *ignorechars*.

If *ignorechars* is specified, it should be a :term:`bytes-like object`
containing characters to ignore from the input when *strict_mode* is true.
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