Exercise 5.3 (nested.py) Write the functions listed below. Use the provided nested.py to write and test your functions. all have value (1st) Takes in a list and returns True if all elements have a value other than all equal (1st) Takes in a list and returns True if all elements are equal and are not '-', False select_row(array, index) Takes in a 2D array (nested list) and row index and returns the -', False otherwise. requested row of the nested list. You may assume i is a valid row index. Remember that indexing starts at 0! select_col(array, index) Same as select_rou) but returns the column indicated by i instead. rt nested 2nested.al1 have.value(['a', 'b', "c]) True 4 >>> nested. all-have-value ( [ ' 1 " ,'-' " . 2 ' ] ) False 6nested.all equal ([x 'x']) True s >nested.all_equal(-' "-', '') False 10 >array-[[1, 2, 3],[4, 5, 6], [7, 8, 91 1nested.select rov(array, 0) 12 [1, 2, 3] 1nested.select col (array, 2) 14 [3, 6, 9