[issue4769] b64decode should accept strings or bytes

[STINNER Victor]

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

Accept unicode string is not "pure", but I agree that it's convinient. Here is a patch:
 * base64.b(16|32|64)encode and b64.encodebytes accept unicode string
 * unicode is first encoded to utf-8 to get a byte string
 * Update the docstrings and the documentation
 * Fix tests

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Added file: http://bugs.python.org/file17463/base64_str.patch

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