Dictionaries Exercises

1. Discuss with someone else how dictionaries work
2. Discuss with someone else what is a key-value pair
3. Compare and contrast using a dictionary and a list
4. Discuss with someone else at least three scenarios to use a dictionary and why
5. Dictionaries can be used to store similar items as keys and their respective values. Write Python code to create a dictionary with your cousins' names (as the keys) and ages (as the values).
6. Dictionaries can also be used to store several items related to a single object. Write Python code to create a dictionary with at least 5 items about your favorite movie (for example, lead actor/actress, year, budget, rating, best quote, genre)
7. Write a Python script that uses a dictionary to store student's grades. Give the user the following choices:

   1. Add a new student
   2. Update a student's grade
   3. Display a student's grade
   4. Remove a student
   5. Quit

8. Dictionary Methods
   1. Given the following code:

      bread = {
          'title': "Grandma's Honey Whole Wheat Bread",
          'ingredients': {
              'honey': '8 oz',
              'oil': '3.5 oz',
              'water': '3.1 pounds',
              'whole wheat flour': '4.5 - 4.75 lbs',
              'yeast': '3 Tablespoons',
              'salt': '1.5 Tablespoons'
          },
          'servings': 84,
          'Nutrition Facts': {
              'calories': 105.5,
              'total fat': '1.6 g',
              'sodium': '118.2 mg',
              'potassium': '3.3 mg',
              'carbohydrates': {
      	    'total': '21.1 g',
                  'dietary fiber': '3.2 g',
                  'sugars': '2.2 g'
              },
              'protein': '3.5 g'
          }
      }

      What do each of the following display:

      1. print( '\nbread.keys()')
         for variable in bread.keys():
             print( variable )

      2. print( '\nbread.values()')
         for variable in bread.values():
             print( variable )

      3. print( '\nbread.items()')
         for variable in bread.items():
             print( variable )

      4. print( '\nbread')
         for variable in bread:
             print( variable )

9. in Operator
   Replace _________________ with appropriate code

   trailMix = { }
   trailMix['title'] = 'Trail Mix'
   ingredientsDictionary = dict(
       peanuts = '2 cups',
       raisins = '2 cups',
       MandMs = '1 1/2 cups'
   )
   trailMix['ingredients'] = ingredientsDictionary
   trailMix['instructions'] = 'Combine all ingredients'
   
   recipes = []
   recipes.append( bread )
   recipes.append( trailMix )
   
   nutritionFactsLabel = 'Nutrition Facts'
   for recipe in recipes:
       title = recipe.get('title', 'No title')
       _________________:
           print( f"{title}'s {nutritionFactsLabel}:" )
           for nfKey in recipe[nutritionFactsLabel]:
               print( nfKey + ': ' + str(recipe[nutritionFactsLabel][nfKey]) )
       else:
           print(f'Note, {title} does not have {nutritionFactsLabel} information')

10. Aliasing and Copying
    1. What will interpreting the following code display?

       gourmetTrailMix = dict( trailMix )
       gourmetTrailMix['title'] = 'Gourmet Trail Mix'
       print( 'gourmetTrailMix:', gourmetTrailMix )
       print( 'trailMix:', trailMix )

    2. What will interpreting the following code display?

       # assumes that ingredients is a valid key
       gourmetTrailMix['ingredients']['almonds'] = gourmetTrailMix['ingredients']['peanuts']
       del gourmetTrailMix['ingredients']['peanuts']
       print( 'gourmetTrailMix:', gourmetTrailMix )
       print( 'trailMix:', trailMix )

11. Discuss with someone else which is faster (and why):
    1. Inserting 1,000,000 words into a sorted list (and continually maintaining it in sorted order) or inserting 1,000,000 of words into a dictionary
    2. For each one of 1,000,000 words, determining if it is in a sorted list or a dictionary