[issue4769] b64decode should accept strings or bytes

[STINNER Victor]

STINNER Victor <victor.stinner at haypocalc.com> added the comment:

About quoted printable, there are two implementations:
 - binascii.a2b_qp() (Modules/binascii.c): C implementation, use 
PyArg_ParseTupleAndKeywords(args, kwargs, "s*|i", ...) to parse the 
data
 - quopri.decode() (Lib/quopri.py): Python implementation
   => quopri.decodestring() uses io.BytesIO() to parse the data

But quopri.decodestring() reuses binascii.a2b_qp() if the binascii 
module is present. So quopri.decodestring behaviour depends of the 
presence of binascii module...
 - binascii present: accept bytes or unicode
 - missing binascii: accept only bytes!

binascii.a2b_qp() encodes unicode string to UTF-8 bytes string.

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nosy: +haypo

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<http://bugs.python.org/issue4769>
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