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45 changes: 45 additions & 0 deletions conversions/bin_to_octal.py
Original file line number Diff line number Diff line change
@@ -0,0 +1,45 @@
"""
The function below will convert any binary string to the octal equivalent.

>>> bin_to_octal("1111")
'17'

>>> bin_to_octal("101010101010011")
'52523'

>>> bin_to_octal("")
Traceback (most recent call last):
...
ValueError: Empty string was passed to the function
>>> bin_to_octal("a-1")
Traceback (most recent call last):
...
ValueError: Non-binary value was passed to the function
"""


def bin_to_octal(bin_string: str) -> str:
if not all(char in "01" for char in bin_string):
raise ValueError("Non-binary value was passed to the function")
if not bin_string:
raise ValueError("Empty string was passed to the function")
oct_string = ""
while len(bin_string) % 3 != 0:
bin_string = "0" + bin_string
bin_string_in_3_list = [
bin_string[index: index + 3]
for index, value in enumerate(bin_string)
if index % 3 == 0
]
for bin_group in bin_string_in_3_list:
oct_val = 0
for index, val in enumerate(bin_group):
oct_val += int(2 ** (2 - index) * int(val))
oct_string += str(oct_val)
return oct_string


if __name__ == "__main__":
from doctest import testmod

testmod()