binary_to_octal.py

"""
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
"""


defbin_to_octal(bin_string: str) ->str:
ifnotall(charin"01"forcharinbin_string):
raiseValueError("Non-binary value was passed to the function")
ifnotbin_string:
raiseValueError("Empty string was passed to the function")
oct_string=""
whilelen(bin_string) %3!=0:
bin_string="0"+bin_string
bin_string_in_3_list= [
bin_string[index : index+3]
forindexinrange(len(bin_string))
ifindex%3==0
 ]
forbin_groupinbin_string_in_3_list:
oct_val=0
forindex, valinenumerate(bin_group):
oct_val+=int(2** (2-index) *int(val))
oct_string+=str(oct_val)
returnoct_string


if__name__=="__main__":
fromdoctestimporttestmod

testmod()