Created octal_to_binary.py and fixed issue #8921

conversions/octal_to_binary.py

@@ -0,0 +1,91 @@
+def octal_to_binary(octal: str) -> str:
+    """
+    Convert an octal value to its binary equivalent
+    >>> octal_to_binary("")
+    Traceback (most recent call last):
+        ...
+    ValueError: Empty string was passed to the function
+    >>> octal_to_binary("-")
+    Traceback (most recent call last):
+        ...
+    ValueError: Non-octal value was passed to the function
+    >>> octal_to_binary("e")
+    Traceback (most recent call last):
+        ...
+    ValueError: Non-octal value was passed to the function
+    >>> octal_to_binary(8)
+    Traceback (most recent call last):
+        ...
+    ValueError: Non-octal value was passed to the function
+    >>> octal_to_binary("-e")
+    Traceback (most recent call last):
+        ...
+    ValueError: Non-octal value was passed to the function
+    >>> octal_to_binary("-8")
+    Traceback (most recent call last):
+        ...
+    ValueError: Non-octal value was passed to the function
+    >>> octal_to_binary("1")
+    '0b1'
+    >>> octal_to_binary("-1")
+    '-0b1'
+    >>> octal_to_binary("12")
+    '0b1010'
+    >>> octal_to_binary(" 12   ")
+    '0b1010'
+    >>> octal_to_binary("-45")
+    '-0b100101'
+    >>> octal_to_binary("-")
+    Traceback (most recent call last):
+        ...
+    ValueError: Non-octal value was passed to the function
+    >>> octal_to_binary("0")
+    '0b0'
+    >>> octal_to_binary("-4055")
+    '-0b100000101101'
+    >>> octal_to_binary("2-0Fm")
+    Traceback (most recent call last):
+        ...
+    ValueError: Non-octal value was passed to the function
+    >>> octal_to_binary("")
+    Traceback (most recent call last):
+        ...
+    ValueError: Empty string was passed to the function
+    >>> octal_to_binary("19")
+    Traceback (most recent call last):
+        ...
+    ValueError: Non-octal value was passed to the function
+    """
+    oct_string = str(octal).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
+    # Converting Decimal to Binary
+    if decimal_number == 0:
+        return "0b0"
+    negative = False
+    if decimal_number < 0:
+        negative = True
+        decimal_number = -decimal_number
+    binary: list[int] = []
+    while decimal_number > 0:
+        binary.insert(0, decimal_number % 2)
+        decimal_number >>= 1
+    if negative:
+        return "-0b" + "".join(str(e) for e in binary)
+    return "0b" + "".join(str(e) for e in binary)
+
+
+if __name__ == "__main__":
+    from doctest import testmod
+
+    testmod()