Octal to Binary Convert

conversions/octal_to_binary.py

@@ -0,0 +1,29 @@
+def octal_to_binary(octal_number):
+    """
+    Convert an octal number to binary.
+
+    Args:
+        octal_number (str): The octal number as a string.
+
+    Returns:
+        str: The binary representation of the octal number.
+    """
+    binary_number = ""
+    octal_digits = "01234567"
+
+    for digit in octal_number:
+        if digit not in octal_digits:
+            raise ValueError("Invalid octal digit")
+
+        binary_digit = ""
+        value = int(digit)
+        for _ in range(3):
+            binary_digit = str(value % 2) + binary_digit
+            value //= 2
+        binary_number += binary_digit
+
+    return binary_number
+
+if __name__ == "__main__":
+    import doctest
+    doctest.testmod()