New submission from umedoblock:

import io
_bytesio = io.BytesIO()

_bytesio.write(b'abc')
_bytesio.write(b'def')
_bytesio.seek(0)
_bytesio.write(b'xyz')

print(_bytesio.read(2))
print(_bytesio.read(2))
print(_bytesio.getvalue())

# output
b'de'
b'f'
b'xyzdef'
# where is the b'abc' ?

----------
components: IO
messages: 168174
nosy: umedoblock
priority: normal
severity: normal
status: open
title: after _bytesio.seek(0), _bytesio.getvalue() returned reversed data.
type: behavior
versions: Python 3.2

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue15644>
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