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Lab 4.04 - Shopping Lists

Part 1

The goal of this lab is to practice using and accessing items from lists of lists.

You have a few errands to run and have created a few shopping lists to help you remember what to buy. You stored your notes in a nested list, shopping_cart. This program will allow the user to ask for a specific item by its index or update what items are in the cart. The user can request to view list to see the items in a specific shopping list.

Shopping Lists

    shopping_lists = [
        ['toothpaste', 'q-tips', 'milk'],
        ['milk', 'candy', 'apples'],
        ['planner', 'pencils', 'q-tips']
    ]

User Inputs

1 - Update

  • The program asks which shopping list the user wants to update, which position it should update, and the new value to update.

2 - View Item

  • The program asks which shopping list the item is on and which position it occupies, then prints the item's name.

3 - View List

  • The program asks which shopping list the user wants and prints all of the items associated with that shopping list.

Functions

update_list

  • Takes in an integer representing the index of the shopping list, an integer representing the index of the item to update, and a string representing the new value for that item. Does not alter the length of the list.

print_item

  • Takes an int representing the index of the shopping list followed by an int representing the index of the item to print.

print_list

  • Takes an int representing the index of the shopping list to print.
  • Feel free to add more functions as you see fit.

Example

    >>> Choose 1 = update item, 2 = view item, or 3 = view list: 1
    Which shopping list would you like to update? 1
    Which item would you like to change? 2
    New value for item #2? cheese
    toothpaste, cheese, milk
    >>> Choose 1 = update item, 2 = view item, or 3 = view list: 2
    Which shopping list do you want to choose? 2
    Which item on list #2 do you want to see? 3
    apples
    >>> Choose 1 = update item, 2 = view item, or 3 = view list: 3
    Which shopping list would you like to see? 3
    planner, pencils, q-tips

Part 2

In this part of the lab you will go through your shopping list program and perform a few different calculations.

  1. Create a function, all_in_one, that will put all the shopping lists into a single combined list using a for loop.
  2. Create a function, count_q_tips, which will go through all items of the list and keep a count of how many times 'q-tips' occurs.
  3. In order to make the shopping lists more calcium rich, write a function, drink_more_milk, that adds 'milk' to each of the lists (unless it's already there).
  4. You can't have milk without cookies. Write a function if_you_give_a_moose_a_cookie, that will go through every element of shopping_cart and update 'milk' to be 'milk and cookies'.

Bonus

Write a function to reverse the order of the lists, and also reverse the order of the items in each list, in the shopping_cart nested list.

The new reversed list should look like the following when printed (newlines and spacing added for clarity):

    shopping_cart = [
        ['q-tips', 'pencils', 'planner'],
        ['apples', 'candy', 'milk'],
        ['milk', 'q-tips', 'tooth paste']
    ]

Tip

  • Last item can be gotten by my_list[-1]
  • Second to last element: my_list[-2]
  • Third to last element: my_list[-3]