New submission from Jussi Judin <jjudin+pyt...@iki.fi>:

base64.b32decode() function leads into "UnboundLocalError: local variable 'acc' 
referenced before assignment" when passing 8 equality signs as data:

>>> import base64
>>> base64.b32decode(b"========")
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/tmp/python-3.7-bin/lib/python3.7/base64.py", line 235, in b32decode
    acc <<= 5 * padchars
UnboundLocalError: local variable 'acc' referenced before assignment

When passing a different number of equality signs, the documented 
binascii.Error exception is thrown.

----------
components: Library (Lib)
messages: 321991
nosy: Barro
priority: normal
severity: normal
status: open
title: base64.b32decode() leads into UnboundLocalError on some data
type: crash
versions: Python 3.7

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue34164>
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