Issue #18011: Silence an unrelated noise introduced in changeset 1b5ef05d6ced.

serhiy-storchaka · serhiy-storchaka · commit 5cc9d32ee9bd · 2013-05-28T15:42:34.000+03:00
diff --git a/Lib/base64.py b/Lib/base64.py
@@ -222,7 +222,7 @@ def b32decode(s, casefold=False, map01=None):
             for c in quanta:
                 acc = (acc << 5) + b32rev[c]
         except KeyError:
-            raise binascii.Error('Non-base32 digit found')
+            raise binascii.Error('Non-base32 digit found') from None
         decoded += acc.to_bytes(5, 'big')
     # Process the last, partial quanta
     if padchars:
