Python/conversions/binary_to_hexadecimal.py

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2021-10-25 07:58:24 +00:00
def bin_to_hexadecimal(binary_str: str) -> str:
"""
Converting a binary string into hexadecimal using Grouping Method
>>> bin_to_hexadecimal('101011111')
'0x15f'
>>> bin_to_hexadecimal(' 1010 ')
'0x0a'
>>> bin_to_hexadecimal('-11101')
'-0x1d'
>>> bin_to_hexadecimal('a')
Traceback (most recent call last):
...
ValueError: Non-binary value was passed to the function
>>> bin_to_hexadecimal('')
Traceback (most recent call last):
...
ValueError: Empty string was passed to the function
"""
BITS_TO_HEX = { # noqa: N806
2021-10-25 07:58:24 +00:00
"0000": "0",
"0001": "1",
"0010": "2",
"0011": "3",
"0100": "4",
"0101": "5",
"0110": "6",
"0111": "7",
"1000": "8",
"1001": "9",
"1010": "a",
"1011": "b",
"1100": "c",
"1101": "d",
"1110": "e",
"1111": "f",
}
# Sanitising parameter
binary_str = str(binary_str).strip()
# Exceptions
if not binary_str:
raise ValueError("Empty string was passed to the function")
is_negative = binary_str[0] == "-"
binary_str = binary_str[1:] if is_negative else binary_str
if not all(char in "01" for char in binary_str):
raise ValueError("Non-binary value was passed to the function")
binary_str = (
"0" * (4 * (divmod(len(binary_str), 4)[0] + 1) - len(binary_str)) + binary_str
)
hexadecimal = []
for x in range(0, len(binary_str), 4):
hexadecimal.append(BITS_TO_HEX[binary_str[x : x + 4]])
hexadecimal_str = "0x" + "".join(hexadecimal)
return "-" + hexadecimal_str if is_negative else hexadecimal_str
if __name__ == "__main__":
from doctest import testmod
testmod()