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import base64


def encode_to_b16(inp: str) -> bytes:
    """
    Encodes a given utf-8 string into base-16.
    >>> encode_to_b16('Hello World!')
    b'48656C6C6F20576F726C6421'
    >>> encode_to_b16('HELLO WORLD!')
    b'48454C4C4F20574F524C4421'
    >>> encode_to_b16('')
    b''
    """
    encoded = inp.encode("utf-8")  # encoded the input (we need a bytes like object)
    b16encoded = base64.b16encode(encoded)  # b16encoded the encoded string
    return b16encoded


if __name__ == "__main__":
    import doctest

    doctest.testmod()

Base16

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