Terry J. Reedy added the comment:
The intended use for str.encode is for same-type transcoding, like this:
I was unaware of the seemingly useless behavior you quote.
>>> 'abc'.encode('base64')
'YWJj\n'
>>> 'YWJj\n'.decode('base64')
'abc'
Here is a similar use for unicode.decode.
>>> u'abc'.encode('base64')
'YWJj\n'
>>> u'YWJj\n'.decode('base64')
'abc'
Any doc change should make the intended use clear if not already.
(Note that the above give lookup errors in 3.x
>>> 'abc'.encode('base64')
...
LookupError: 'base64' is not a text encoding; use codecs.encode() to handle
arbitrary codecs)
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nosy: +terry.reedy
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<http://bugs.python.org/issue26369>
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