Python: bytes to hex string

bytes2hexstring.py

def byte2hexstring(b, spacing=" ", upper_case=True):
    """
    Converts bytes into hex string.

    Args:
        b (bytes): Bytes to be converted
        spacing (string): Spacing between each couple of hex charachters. Defaults to single space
        upper_case: If True, uses upper-case letters for the digits above 9

    Returns:
        String with hex representation of input bytes

    Example:
        >>> byte2hexstring(b"\xde\xad\xbe\xef")
        "DE AD BE EF"
    """
    if upper_case:
        hex_format = "%2.2X"
    else:
        hex_format = "%2.2x"
    return spacing.join(list(map(hex_format.__mod__, b)))