Serhiy Storchaka added the comment:
I suppose this is related to pickling.
I were puzzled why it works with bytearray subclasses. But now I investigated
that print() implicitly converts str and bytearray subclasses to str and left
unicode subclasses as is. You can reproduce this bug for str and bytearray
subclasses if use sys.stdout.write() instead of print().
Here is a patch for 2.7 which fixes the issue for str and bytearray subclasses
too. 3.x needs patch too.
>>> class U(unicode): pass
>>> class S(str): pass
>>> class BA(bytearray): pass
>>> import sys
>>> sys.stdout.write(u'\u20ac')
€
>>> sys.stdout.write('\xe2\x82\xac')
€
>>> sys.stdout.write(bytearray('\xe2\x82\xac'))
€
>>> sys.stdout.write(U(u'\u20ac'))
€
>>> sys.stdout.write(S('\xe2\x82\xac'))
€
>>> sys.stdout.write(BA('\xe2\x82\xac'))
€
----------
versions: +Python 3.3, Python 3.4
Added file:
http://bugs.python.org/file32490/idle_write_string_subclass-2.7.patch
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<http://bugs.python.org/issue19481>
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