[issue21416] argparse should accept bytes arguments as originally passed

[paul j3]

paul j3 added the comment:

'invalid bytes value' is the error message generated by 'argparse'.  The 
underlying error (for a string like 'xxx') is:

    print(bytes(sys.argv[1]))
    TypeError: string argument without an encoding

You could use 'bytes' if you somehow supply the encoding, as in:

    def mybytes(astr):
       return bytes(astr, 'utf-8')

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<http://bugs.python.org/issue21416>
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