Minor polishing changes

- Reword NEWS.d entry to "Base32" instead of "base-32". No prior entries have ever mentioned "base-64", etc., but they have mentioned "Base64", etc., so this is more consistent. - Reword whatsnew entry to "Base32" instead of "Base 32". No prior entries have ever mentioned "Base 64", etc., and there is an entry a little further up mentioning "Ascii85, Base85, and Z85", so this is more consistent. - Add a whatsnew entry in Optimizations > base64 & binascii section. - Whitespace change in `binascii.c`.
python · serhiy-storchaka · Mar 22, 2026 · Mar 20, 2026 · Mar 20, 2026 · Mar 21, 2026
commit e3ee6df8be3f197fd3cb1fc11dd68b37317bdd58
@@ -662,7 +662,7 @@ binascii
 * Added the *ignorechars* parameter in :func:`~binascii.a2b_base64`.
   (Contributed by Serhiy Storchaka in :gh:`144001`.)
 
-* Added functions for Base 32 encoding:
+* Added functions for Base32 encoding:
 
   - :func:`~binascii.b2a_base32` and :func:`~binascii.a2b_base32`
 
@@ -1285,6 +1285,10 @@ base64 & binascii
   two orders of magnitude less memory.
   (Contributed by James Seo and Serhiy Storchaka in :gh:`101178`.)
 
+* Implementation for Base32 has been rewritten in C.
+  Encoding and decoding is now two orders of magnitude faster.
+  (Contributed by James Seo in :gh:`146192`)
+
 
 csv
 ---

diff --git a/Misc/NEWS.d/next/Core_and_Builtins/2026-03-20-00-39-25.gh-issue-146192.8aQ6sC.rst b/Misc/NEWS.d/next/Core_and_Builtins/2026-03-20-00-39-25.gh-issue-146192.8aQ6sC.rst
@@ -1,2 +1,2 @@
-Add base32 support to :mod:`binascii` and improve the performance of the
-base-32 converters in :mod:`base64`. Patch by James Seo.
+Add Base32 support to :mod:`binascii` and improve the performance of the
+Base32 converters in :mod:`base64`. Patch by James Seo.
diff --git a/Modules/binascii.c b/Modules/binascii.c
@@ -1598,8 +1598,8 @@ binascii_a2b_base32_impl(PyObject *module, Py_buffer *data,
             state = get_binascii_state(module);
             if (state) {
                 PyErr_SetString(state->Error, (octa_pos + pads == 8)
-                    ? "Excess data after padding"
-                    : "Discontinuous padding not allowed");
+                                ? "Excess data after padding"
+                                : "Discontinuous padding not allowed");
             }
             goto error;
         }