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Loops
Nested Loops

Loops can be nested in Python, as they can with other programming languages. We will find certain situations that require nested loops.

Suppose we are in charge of a science class, that is split into three project teams:

``project_teams = [["Ava", "Samantha", "James"], ["Lucille", "Zed"], ["Edgar", "Gabriel"]]``

Using a for or while loop can be useful here to get each team:

``````for team in project_teams:
print(team)``````

Would output:

``````["Ava", "Samantha", "James"]
["Lucille", "Zed"]
["Edgar", "Gabriel"]``````

But what if we wanted to print each individual student? In this case we would actually need to nest our loops to be able loop through each sub-list. Here is what it would look like:

``````# Loop through each sublist
for team in project_teams:
# Loop elements in each sublist
for student in team:
print(student)``````

This would output:

``````Ava
Samantha
James
Lucille
Zed
Edgar
Gabriel``````

Let’s practice wiriting a nested loop!

### Instructions

1.

We have provided the list `sales_data` that shows the numbers of different flavors of ice cream sold at three different locations: Scoopcademy, Gilberts Creamery, and Manny’s Scoop Shop.

We want to sum up the total number of scoops sold. Start by defining a variable `scoops_sold` and set it to zero.

2.

Loop through the `sales_data` list using the following guidelines:

1. For our temporary variable of the for loop, call it `location`.
2. `print()` out each `location` list.
3.

Within our `sales_data` loop, nest a secondary loop to go through each `location` sublist element and add the element value to `scoops_sold`.

By the end, you should have the sum of every number in the `sales_data` nested list.

4.

Print out the value of `scoops_sold` outside of the nested loop.