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+#!/usr/bin/env python3
+
+from typing import Iterable
+
+
+def running_sum(nums: list[int]) -> list[int]:
+    """
+    You are given an array of integers.
+
+    Write a script to return the running sum of the given array.
+    The running sum can be calculated as sum[i] = num[0] + num[1] + …. + num[i]
+
+    Example 1
+    Input: @int = (1, 2, 3, 4, 5)
+    Output: (1, 3, 6, 10, 15)
+    >>> assert (1, 3, 6, 10, 15) == running_sum([1, 2, 3, 4, 5])
+    Example 2
+    Input: @int = (1, 1, 1, 1, 1)
+    Output: (1, 2, 3, 4, 5)
+    >>> assert (1, 2, 3, 4, 5) == running_sum([1, 1, 1, 1, 1])
+    Example 3
+    Input: @int = (0, -1, 1, 2)
+    Output: (0, -1, 0, 2)
+    >>> assert ( 0, -1, 0, 2) == running_sum([0, -1, 1, 2])
+    """
+    return list(running_sum_it(nums))
+
+
+def running_sum_it(nums: list[int]) -> Iterable[int]:
+    """
+    You are given an array of integers.
+
+    return an iterator of the running sum of the given array.
+    The running sum can be calculated as sum[i] = num[0] + num[1] + …. + num[i]
+
+    Example 1
+    Input: @int = (1, 2, 3, 4, 5)
+    Output: (1, 3, 6, 10, 15)
+    >>> assert (1, 3, 6, 10, 15) == list(running_sum([1, 2, 3, 4, 5]))
+    Example 2
+    Input: @int = (1, 1, 1, 1, 1)
+    Output: (1, 2, 3, 4, 5)
+    >>> assert (1, 2, 3, 4, 5) == list(running_sum([1, 1, 1, 1, 1]))
+    Example 3
+    Input: @int = (0, -1, 1, 2)
+    Output: (0, -1, 0, 2)
+    >>> assert ( 0, -1, 0, 2) == list(running_sum([0, -1, 1, 2]))
+    """
+
+    current_sum = 0
+    for i in nums:
+        current_sum += i
+        yield current_sum
+
+
+if __name__ == "__main__":
+    import unittest
+
+    tests = [
+        ([1, 2, 3, 4, 5], [1, 3, 6, 10, 15]),
+        ([1, 1, 1, 1, 1], [1, 2, 3, 4, 5]),
+        ([0, -1, 1, 2], [0, -1, 0, 2]),
+    ]
+    tester = unittest.TestCase()
+    for input, expected in tests:
+        tester.assertEqual(expected, running_sum(input))