[issue33770] base64 throws 'incorrect padding' exception even though the string length is a multiple of 4

[R. David Murray]

R. David Murray <rdmurray at bitdance.com> added the comment:

I always assumed that any string composed of valid base64 characters could be decoded to *something* if you added some padding characters, but apparently that was an invalid assumption.  I agree that the message is incorrect for this case.

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nosy: +r.david.murray
stage:  -> needs patch
type:  -> behavior
versions: +Python 2.7, Python 3.7, Python 3.8

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<https://bugs.python.org/issue33770>
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