The third function you will write should be called fileSum. Your function should take one (1) argument: a string containing a file name.

The function should return one (1) integer. The file name will be the name of a file containing one integer on each line. Your function will return the sum of all the integers in the file. Make no assumptions regarding the number of integers in the file. The example file nums.txt, available from the website, is used in the following example. The following example assumes nums.txt is in the same directory as your working Python directory as discussed in class.

Example Test Case:

fileSum(nums.txt) 

returns

20

file contains :2,3,4,5,6