Update lists

python/lists

@@ -2,19 +2,26 @@
 
 # use square brackets to get one item of a list using index.
 # note that first item has index 0. 
+# to get that first item, 67, scores[0]
 scores = [67, 32, 29]
 print(scores[2])
 
 print()  # print blank line
 
+# sum is a function built into python lists. 
+# if all items in the list are numeric it will add them up.
+# len gives you the number of items in the list, here 3 items.
 print(sum(scores))
 print(len(scores))
 
 print()
 
 # USING A FOR LOOP TO ITERATE A LIST
+# our variable for the list is scores
+# we use score as a variable for list iteration.
+# each time through the loop, score takes on the next value in the list
 for score in scores:
-  if score % 2 == 0:
+  if score % 2 == 0:    # % is called mod, and gives you the remainder of a division
     print(score, ' is even.')
 
 print()