Serhiy Storchaka added the comment:
There is also a problem with deepcopying:
>>> class MemReader:
... def __init__(self, data):
... self.buf = memoryview(data).cast('B')
... def read(self, size=-1):
... if size < 0:
... size = len(self.buf)
... res = bytes(self.buf[:size])
... self.buf = self.buf[size:]
... return res
... def close():
... pass
... def __deepcopy__(self, memo):
... return MemReader(self.buf)
... def __reduce__(self):
... return MemReader, (bytes(self.buf),)
...
>>> import codecs, copy
>>> s1 = codecs.getreader('utf-8')(MemReader(b'abcd'))
>>> s2 = copy.deepcopy(s1)
>>> s1.read()
'abcd'
>>> s2.read()
b'abcd'
>>> s2
<__main__.MemReader object at 0xb701988c>
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue6395>
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