add an octal_to_binary converter

conversions/octal_to_binary.py

@@ -0,0 +1,49 @@
+"""
+Convert a octal value to its binary equivalent
+>>> octal_to_binary("17")
+'1111'
+>>> octal_to_binary("52523")
+'101010101010011'
+>>> octal_to_binary("532.51")
+'101011010.101001'
+"""
+
+
+from operator import index
+
+
+def octal_to_binary(octal_string: str) -> str:
+    if not all(char in "01234567." for char in octal_string):
+        raise ValueError("Non-octal value was passed to the function")
+    if not octal_string:
+        raise ValueError("Empty string was passed to the function")
+    binary_string = ""
+    dict_of_octal_to_binary = {
+        "0": "000",
+        "1": "001",
+        "2": "010",
+        "3": "011",
+        "4": "100",
+        "5": "101",
+        "6": "110",
+        "7": "111",
+    }
+    indexl = 0
+    for i in octal_string:
+        if i == ".":
+            binary_string += "."
+            continue
+        if binary_string == "":
+            for char in dict_of_octal_to_binary[i]:
+                if char != "0" or indexl >= 1:
+                    binary_string += char
+                    indexl += 1
+        else:
+            binary_string += dict_of_octal_to_binary[i]
+    return binary_string
+
+
+if __name__ == "__main__":
+    from doctest import testmod
+
+    testmod()