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  r85674 | r.david.murray | 2010-10-17 19:12:16 -0400 (Sun, 17 Oct 2010) | 2 lines

  Tighten up 'byte string' wording in base64 docs.
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R. David Murray 2010-12-06 18:52:48 +00:00
parent abb10753c5
commit 269a881d9a
1 changed files with 21 additions and 19 deletions
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32
Doc/library/base64.rst
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@ -10,21 +10,23 @@
single: MIME; base64 encoding single: MIME; base64 encoding
This module provides data encoding and decoding as specified in :rfc:`3548`. This module provides data encoding and decoding as specified in :rfc:`3548`.
This standard defines the Base16, Base32, and Base64 algorithms for encoding and This standard defines the Base16, Base32, and Base64 algorithms for encoding
decoding arbitrary binary strings into text strings that can be safely sent by and decoding arbitrary binary strings into ASCII-only byte strings that can be
email, used as parts of URLs, or included as part of an HTTP POST request. The safely sent by email, used as parts of URLs, or included as part of an HTTP
encoding algorithm is not the same as the :program:`uuencode` program. POST request. The encoding algorithm is not the same as the
:program:`uuencode` program.
There are two interfaces provided by this module. The modern interface supports There are two interfaces provided by this module. The modern interface
encoding and decoding string objects using all three alphabets. The legacy supports encoding and decoding ASCII byte string objects using all three
interface provides for encoding and decoding to and from file-like objects as alphabets. The legacy interface provides for encoding and decoding to and from
well as strings, but only using the Base64 standard alphabet. file-like objects as well as byte strings, but only using the Base64 standard
alphabet.
The modern interface provides: The modern interface provides:
.. function:: b64encode(s, altchars=None) .. function:: b64encode(s, altchars=None)
Encode a byte string use Base64. Encode a byte string using Base64.
*s* is the string to encode. Optional *altchars* must be a string of at least *s* is the string to encode. Optional *altchars* must be a string of at least
length 2 (additional characters are ignored) which specifies an alternative length 2 (additional characters are ignored) which specifies an alternative
@ -39,9 +41,9 @@ The modern interface provides:
Decode a Base64 encoded byte string. Decode a Base64 encoded byte string.
*s* is the string to decode. Optional *altchars* must be a string of at least *s* is the byte string to decode. Optional *altchars* must be a string of
length 2 (additional characters are ignored) which specifies the alternative at least length 2 (additional characters are ignored) which specifies the
alphabet used instead of the ``+`` and ``/`` characters. alternative alphabet used instead of the ``+`` and ``/`` characters.
The decoded byte string is returned. A :exc:`TypeError` is raised if *s* were The decoded byte string is returned. A :exc:`TypeError` is raised if *s* were
incorrectly padded or if there are non-alphabet characters present in the incorrectly padded or if there are non-alphabet characters present in the
@ -81,9 +83,9 @@ The modern interface provides:
Decode a Base32 encoded byte string. Decode a Base32 encoded byte string.
*s* is the string to decode. Optional *casefold* is a flag specifying whether a *s* is the byte string to decode. Optional *casefold* is a flag specifying
lowercase alphabet is acceptable as input. For security purposes, the default whether a lowercase alphabet is acceptable as input. For security purposes,
is ``False``. the default is ``False``.
:rfc:`3548` allows for optional mapping of the digit 0 (zero) to the letter O :rfc:`3548` allows for optional mapping of the digit 0 (zero) to the letter O
(oh), and for optional mapping of the digit 1 (one) to either the letter I (eye) (oh), and for optional mapping of the digit 1 (one) to either the letter I (eye)