Octal to Binary Convert

conversions/octal_to_binary.py

@@ -0,0 +1,54 @@
+"""
+* Author: Bama Charan Chhandogi (https://github.com/BamaCharanChhandogi)
+* Description: Convert a Octal number to Binary.
+
+References for better understanding:
+https://en.wikipedia.org/wiki/Binary_number
+https://en.wikipedia.org/wiki/Octal
+"""
+
+
+def octal_to_binary(octal_number: str) -> str:
+    """
+    Convert an Octal number to Binary.
+
+    >>> octal_to_binary("17")
+    '001111'
+    >>> octal_to_binary("7")
+    '111'
+    >>> octal_to_binary("Av")
+    Traceback (most recent call last):
+        ...
+    ValueError: Non-octal value 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("")
+    Traceback (most recent call last):
+        ...
+    ValueError: Empty string was passed to the function
+    """
+    if not octal_number:
+        raise ValueError("Empty string was passed to the function")
+
+    binary_number = ""
+    octal_digits = "01234567"
+    for digit in octal_number:
+        if digit not in octal_digits:
+            raise ValueError("Non-octal value was passed to the function")
+
+        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()