Implement Indexed Sum Calculation Function

prometheus.py

@@ -0,0 +1,19 @@
+ def calculate_sum(my_list: list[int]) -> int:
+    """
+    Calculates the sum of a list of integers, where each number is multiplied by its index before being added to the sum.
+
+    :param my_list: List of integers
+    :return: Sum of integers multiplied by their index
+    """
+    if not isinstance(my_list, list):
+        raise TypeError("Input must be a list")
+
+    return sum(index * num for index, num in enumerate(my_list, start=1))
+
+
+# Example usage
+example_list_1 = [1, 2, 3, 4]
+example_list_2 = [0, -1, 2, -3]
+
+print(calculate_sum(example_list_1))  # Output: 30
+print(calculate_sum(example_list_2))  # Output: -5