Checkpoint 10.4.1.
Now try rearranging these code fragments to make a function that counts all the leaf items in a nested list like nested1 above, the items at the lowest level of nesting (8 of them in nested1).
Section 10.4 Nested Iteration
When you have nested data structures, especially lists and/or dictionaries, you will frequently need nested for loops to traverse them.
Line 3 executes once for each top-level list, three times in all. With each sub-list, line 5 executes once for each item in the sub-list. Try stepping through it in Codelens to make sure you understand what the nested iteration does.
Check Your Understanding
Checkpoint 10.4.2.
2. Below, we have provided a list of lists that contain information about people. Write code to create a new list that contains every person’s last name, and save that list as
last_names.Checkpoint 10.4.3.
3. Below, we have provided a list of lists named
L. Use nested iteration to save every string containing “b” into a new list named b_strings.You have attempted 1 of 6 activities on this page.
