Convert a string in ASCII hexadecimal notation into a list of integers.

convert_hexstring.py

# -*- coding:utf-8 -*-
"""Convert a string in ASCII hexadecimal notation into a list of integers.

Example::

    >>> convert_hexstring('F0 7E 7F 06 01 F7')
    [240, 126, 127, 6, 1, 247]
    >>> convert_hexstring('f07E7F 6 1 F7')
    [240, 126, 127, 6, 1, 247]

You may use upper or lowercase letters for hexadecimal numbers and arbitrary
whitespace between bytes. When there is no whitespace between numbers, each
byte must have two hexadecimal digits, using a leading zero if necessary.

"""

__all__ = ('convert_hexstring',)


def convert_hexstring(s):
    """Return bytes from hexadecimal notation in s as a list of integers."""
    result = []
    for group in s.split():
        for hex in (group[i:i+2] for i in range(0, len(group), 2)):
            result.append(int(hex, 16))
    return result


if __name__ == '__main__':
    totest = (
        ('F0 7E 7F 06 01 F7', [240, 126, 127, 6, 1, 247]),
        ('F07E7F0601F7', [240, 126, 127, 6, 1, 247]),
        ('f07e7f0601f7', [240, 126, 127, 6, 1, 247]),
        ('f0 7e 7f 06 01 f7', [240, 126, 127, 6, 1, 247]),
        ('f0 7e 7f 6 1 f7', [240, 126, 127, 6, 1, 247]),
        ('f07E7f 6 1 F7', [240, 126, 127, 6, 1, 247])
    )

    for s, expected in totest:
        assert convert_hexstring(s) == expected