Serhiy Storchaka added the comment:
printf-style bytes formatting was added mainly for increasing compatibility
with Python 2. It was restricted to support mostly features existing in Python
2.
'%s' formatting in Python 3 supports bytes-like objects partially:
>>> b'%s' % array('B', [1, 2])
"array('B', [1, 2])"
>>> b'%s' % buffer(array('B', [1, 2]))
'\x01\x02'
>>> b'%s' % memoryview(array('B', [1, 2]))
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: cannot make memory view because object does not have the buffer
interface
>>> b'%s' % bytearray(b'abc')
'abc'
>>> b'%s' % buffer(bytearray(b'abc'))
'abc'
>>> b'%s' % memoryview(bytearray(b'abc'))
'<memory at 0xb70902ac>'
I don't know whether there is a need of supporting the buffer protocol in
printf-style bytes formatting. bytearray is already supported, buffer() doesn't
exist in Python 3, memoryview() is not supported in Python 2. Seems this
doesn't add anything for increasing the compatibility.
----------
nosy: +skrah
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue28856>
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