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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def bytes_hack(buf):
 """ Hacky workaround for old installs of the library on systems without python-future that were keeping the 2to3 update from working after auto-update. """

    ub = None
    if sys.version_info > (3,):
        ub = buf
    else:
        ub = bytes(buf)

    return ub