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67 lines
1.7 KiB
Python
67 lines
1.7 KiB
Python
BITS_TO_HEX = {
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"0000": "0",
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"0001": "1",
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"0010": "2",
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"0011": "3",
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"0100": "4",
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"0101": "5",
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"0110": "6",
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"0111": "7",
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"1000": "8",
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"1001": "9",
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"1010": "a",
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"1011": "b",
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"1100": "c",
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"1101": "d",
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"1110": "e",
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"1111": "f",
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}
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def bin_to_hexadecimal(binary_str: str) -> str:
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"""
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Converting a binary string into hexadecimal using Grouping Method
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>>> bin_to_hexadecimal('101011111')
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'0x15f'
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>>> bin_to_hexadecimal(' 1010 ')
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'0x0a'
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>>> bin_to_hexadecimal('-11101')
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'-0x1d'
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>>> bin_to_hexadecimal('a')
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Traceback (most recent call last):
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...
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ValueError: Non-binary value was passed to the function
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>>> bin_to_hexadecimal('')
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Traceback (most recent call last):
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...
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ValueError: Empty string was passed to the function
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"""
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# Sanitising parameter
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binary_str = str(binary_str).strip()
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# Exceptions
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if not binary_str:
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raise ValueError("Empty string was passed to the function")
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is_negative = binary_str[0] == "-"
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binary_str = binary_str[1:] if is_negative else binary_str
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if not all(char in "01" for char in binary_str):
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raise ValueError("Non-binary value was passed to the function")
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binary_str = (
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"0" * (4 * (divmod(len(binary_str), 4)[0] + 1) - len(binary_str)) + binary_str
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)
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hexadecimal = []
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for x in range(0, len(binary_str), 4):
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hexadecimal.append(BITS_TO_HEX[binary_str[x : x + 4]])
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hexadecimal_str = "0x" + "".join(hexadecimal)
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return "-" + hexadecimal_str if is_negative else hexadecimal_str
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if __name__ == "__main__":
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from doctest import testmod
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testmod()
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