Python

Exercise

In this assignment you will write a program that will read a file containing nutrition information from the five major food groups (e.g. fruit, vegetable, dairy, proteins, and grains) . Each row of data in the file contains four bits of information. You will store the data from the file in a multi-dimensional list (a list of lists). You will present the users with a menu so that they can choose one of the five food groups to view. Once the user enters a type, the code will loop through the main data list in order to build separate smaller multi-dimensioned lists containing only information for each particular food group. The code will then write out to the screen in a nicely formatted columned output the information requested.

Specifications - Follow the steps below to write the program

Write a function named "read_data()" that builds a list of lists from the provided data file (nutrition_data.csv). In this function you'll need to:

Create an empty list variable that will contain the list of lists

Create a while loop that reads each line from the data file. Each line in the file contains a comma separated string of four items. As you read the line, also strip the " " from the end of the line and store it temporarily in a variable

Use a Split() function to split the temporary line variable based on a comma. This will create a list of those items.

Append this new small list to the main list variable created in the first bullet point

Close the file

Return the new main list

Write a function named "create_separate_list()" that takes two parameter. The first parameter will receive the main list and the second parameter will hold the value of the user's menu choice. This function will build 5 separate lists containing the nutrition information separated by food group. It will only return the appropriate list based on the user's selection.

Create five empty lists. Name the new lists appropriately to match the food groups

Use a "For In" loop to iterate through the main list variable that was passed into the function in the first parameter

Since each line inside the main list variable contains four items of information, and knowing that the first item is the name of the food group, we can use a "if/elif" decision block with a decision path for each food group to append the current row to the correct food group list. This will separate the items into their very own list. NOTE: you can look at just the first item in a row by using a zero index. If we have "for x in main_list" then x[0] contains the name of the food group for that row

After the "For In" loop you then need a second "if/elif" block to test which food group the user chose. Remember, this is in the second parameter of the function. Based on the results you should return the correct food group list.

Write a function named "display_menu()" that prints the menu to the screen

Write a function named "main()" that contains the code loop for user interaction

Call the read_data() function and store the results in a list variable

Start a "while True:" loop

Call the display_menu() function

Prompt the user for a menu choice (1,2,3,etc.)

Use an "if/else" to validate that the user has enter a number that is 1 - 5. If not print a warning message

Inside the "if" statement, call the create_separate_list() function and pass in two parameter values; the main list variable, and the user's menu choice. Store the returned list in a variable

Sort the list variable that holds the returned list

Print the list items in a nicely formatted output using fixed width columns. You'll use a "for/in" loop to move through the list

Prompt the user to decide if they want to continue or not. End the loop if the choice is "n"

Sample input/output:

Nutrition by Food Group 1. Dairy 2. Meat 3. Vegetables 4. Fruit 5. Grains

Enter your food group choice: (1-5): 1

Name Amount Calories ---------------------------------------------------------------------- Buttermilk 1 cup 127 Cheese - Cheddar 1/2 cup 226 Cheese - Swiss 1 oz. 105 Cheese - cottage 1 cup 240 Cream cheese 1 oz. 105 Goats milk 1 cup 165 Heavy whipping 1/2 cup 430 Ice cream 1 cup 300 Milk - Skim 1 qt. 360 Milk - whole 1 qt. 660 half-and-half 1/2 cup 170 Would you like to perform another conversion? (y/n): y Nutrition by Food Group 1. Dairy 2. Meat 3. Vegetables 4. Fruit 5. Grains

Enter your food group choice: (1-5): 3

Name Amount Calories ---------------------------------------------------------------------- Asparagus 6 spears 18 Broccoli steamed 1 cup 45 Carrots 1 cup 45 Eggplant 1 cup 30 Green Beans 1 cup 25 Green Peas 1 cup 66 Lettuce 1/4 head 14 Mushrooms 4 12 Mustard greens 1 30 Okra 1 1/3 cups 32 Peppers 1 pod 10 Potatoes 1 med. 100 Squash 1 cup 35 Sweet potatoes 1 med. 155 Turnip greens 1 cup 45 Would you like to perform another conversion? (y/n): n Thanks, bye!