Write a function called csv$\_($s$)$um that takes a filename and returns a list containing the sums of

every line of numbers in the file. The numbers are in a CSV $($comma separated value$)$ format. For

instance, if the contents of a file are:

$12,3,2$

$-5$

$10,20,-10,8\mathrm{.}3$

Then the function should return $17,-5,28\mathrm{.}3$