diff --git a/conversions/octal_to_binary.py b/conversions/octal_to_binary.py
index 3953ed795..40bf61207 100644
--- a/conversions/octal_to_binary.py
+++ b/conversions/octal_to_binary.py
@@ -1,74 +1,77 @@
-def octal_to_binary(octal:str) -> str:
+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
     """
-   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('-')
+    is_negative = oct_string.startswith("-")
     if is_negative:
         oct_string = oct_string[1:]
-        binary_num = '-0b'
+        binary_num = "-0b"
     else:
-        binary_num = '0b'
+        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()