Created octal_to_binary.py and fixed issue #8921

conversions/octal_to_binary.py

@@ -0,0 +1,77 @@
+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.startswith("-")
+    if is_negative:
+        oct_string = oct_string[1:]
+        binary_num = "-0b"
+    else:
+        binary_num = "0b"
+    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")
+    binary_num += str(bin(int(oct_string, 8)))[2:]
+    return binary_num
+
+
+if __name__ == "__main__":
+    from doctest import testmod
+
+    testmod()