For my question, I need to write a code in Python 3 that uses a function sum_1k(M) that returns the sum( ). I need to compute s for M = 3 by hand and write a second function called test_sum_1k() that calls sum_1k(3) and checks to see if the answer is correct. When sum_1k(3) function is called, you should receive some message according to if the test is successful or not.