Python/conversions/octal_to_decimal.py

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def oct_to_decimal(oct_string: str) -> int:
"""
Convert a octal value to its decimal equivalent
>>> oct_to_decimal("12")
10
>>> oct_to_decimal(" 12 ")
10
>>> oct_to_decimal("-45")
-37
>>> oct_to_decimal("2-0Fm")
Traceback (most recent call last):
...
ValueError: Non-octal value was passed to the function
>>> oct_to_decimal("")
Traceback (most recent call last):
...
ValueError: Empty string was passed to the function
>>> oct_to_decimal("19")
Traceback (most recent call last):
...
ValueError: Non-octal value was passed to the function
"""
oct_string = str(oct_string).strip()
if not oct_string:
raise ValueError("Empty string was passed to the function")
is_negative = oct_string[0] == "-"
if is_negative:
oct_string = oct_string[1:]
if not oct_string.isdigit() or not all(0 <= int(char) <= 7 for char in oct_string):
raise ValueError("Non-octal value was passed to the function")
decimal_number = 0
for char in oct_string:
decimal_number = 8 * decimal_number + int(char)
if is_negative:
decimal_number = -decimal_number
return decimal_number
if __name__ == "__main__":
from doctest import testmod
testmod()