[issue7701] fix output string length for binascii.b2a_uu()

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

>>> [len(binascii.b2a_uu("x"*bin_len)) for bin_len in xrange(10)]
    [2, 6, 6, 6, 10, 10, 10, 14, 14, 14]
    >>> [(2+(bin_len+2)*4//3) for bin_len in xrange(10)]
    [4, 6, 7, 8, 10, 11, 12, 14, 15, 16]

How is this the correct estimation? The results are different.

Try the following:

>>> [(2+(bin_len+2)//3*4) for bin_len in xrange(10)]
[2, 6, 6, 6, 10, 10, 10, 14, 14, 14]

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nosy: +pitrou

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue7701>
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