Terry J. Reedy <tjre...@udel.edu> added the comment:

Whatever is done, I think a bytearray should be handled the same as bytes. It 
must be that they give the same result. In basic operations, I believe that 
bytearrays can *always* substitute for bytes. "Bytes and bytearray objects 
contain single bytes – the former is immutable while the latter is a mutable 
sequence." For example:
>>> b'abc'.capitalize()
b'Abc'
>>> bytearray(b'abc').capitalize()
bytearray(b'Abc')

This, to me, implies that .fromstring should accept bytearray (though probably 
not general buffer objects). In 2.x, I understand .fromstring to initialize an 
array from machine bytes read into a string, but not .fromunicode. This is 
*not* a text method, and the result may vary for 2 and 4-byte unicode builds. 
So I can see that 3.x needs .fromstring(bytes) but not .fromunicode(string).

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue8990>
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