Well, you can make both Python 2 & 3 string msg types be bytes with a note that bytes is the same as str in Python2.

    $ python2
    Python 2.7.13 (default, Jul 21 2017, 03:24:34) 
    >>> a = str('123')
    >>> type(a)
    <type 'str'>
    >>> a = bytes('123')
    >>> type(a)
    <type 'str'>





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