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>>> tn.write(b'guido\r\n')
>>> print(tn.read_all())
Login       Name               TTY         Idle    When    Where
guido    Guido van Rossum      pts/2        <Dec  2 11:10> snag.cnri.reston..

>>>

Note that read_all() won't read until eof -- it just reads some data
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even if there was data on the socket, because the protocol negotiation may have
eaten the data.  This is why EOFError is needed in some cases to distinguish
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