7. group_friends_by_food For this problem, you are given a mostly-working version of the Friend and FriendsDB classes from hw6 and hw7, and we will add new method to FriendsDB -- group_friends_by_food. group_friends_by_food returns a dictionary mapping from each of the favorite foods enjoyed by any friend to a list of the friends who enjoy that food, sorted in alphabetical order. (You can use the friends_who_love method to generate these lists.) A sample run should look like this: >>> friend1 = Friend("sarah", 165) >>> friend1.add_favorite_food("strawberries") >>> friend2 = Friend("dweezil", 175) >>> friend2.add_favorite_food("pizza") >>> friend3 = Friend("bimmy", 60) >>> friend3.add_favorite_food("pizza") >>> friend3.add_favorite_food("strawberries") >>> db = FriendsDB() >>> db.add_friend(friend1) >>> db.add_friend(friend2) >>> db.add_friend(friend3) >>> db.group_friends_by_food() {'strawberries': ['bimmy', 'sarah'], 'pizza': ['bimmy', 'dweezil']}

7. group_friends_by_food For this problem, you are given a mostly-working version of the Friend and FriendsDB classes from hw6 and hw7, and we will add new method to FriendsDB -- group_friends_by_food. group_friends_by_food returns a dictionary mapping from each of the favorite foods enjoyed by any friend to a list of the friends who enjoy that food, sorted in alphabetical order. (You can use the friends_who_love method to generate these lists.) A sample run should look like this: >>> friend1 = Friend("sarah", 165) >>> friend1.add_favorite_food("strawberries") >>> friend2 = Friend("dweezil", 175) >>> friend2.add_favorite_food("pizza") >>> friend3 = Friend("bimmy", 60) >>> friend3.add_favorite_food("pizza") >>> friend3.add_favorite_food("strawberries") >>> db = FriendsDB() >>> db.add_friend(friend1) >>> db.add_friend(friend2) >>> db.add_friend(friend3) >>> db.group_friends_by_food() {'strawberries': ['bimmy', 'sarah'], 'pizza': ['bimmy', 'dweezil']}

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Create an Ordered Doubly Linked List in C++. Remember that an ordered Linked List is one where inserts automatically place a new node so that all the nodes retain a certain order. This list should be templated where items should be in "ascending" order (i.e., if it is a list of numbers, it should be of order of least to greatest).
import json, datetime, csvfrom pprint import pprint Question 3 - Using the cleaned list of lists from question 1, create a dictionary of dictionaries where each key in the outer dictionary is an author whose last name starts with the letter 'S'. - Each inner dictionary should contain the number of books that author has written as 'Number of Books' - It should contain the earliest book title for that author based on year with the key 'First Book' - Finally it should contain the latest book title for that author based on year with the key 'Last Book' - If an author has only one book put the same title in both places - Return the dictionary of dictionaries def author_history(cleaned_list): Args: cleaned_list (list) Returns: dictionary of dictionaries Output: {'SafranFoer,Jonathan': {'First Book': 'ExtremelyLoudandIncrediblyClose', 'Last Book': 'ExtremelyLoudandIncrediblyClose',…
Numpy
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Assume, you have been given a dictionary where the keys present the name of the father and the value is a list of names of the sons of that person. For example A has 3 sons namely X, Y, and Z. Again X has three sons namely E, F, and G. So, A is the grandfather of E, F, and G. family = {"A" : ["X", "Y", "Z"], "B": ["M", "N"], "W" : ["A", "B"], "X" : ["E", "F", "G"]} You need to write a code which takes an input and prints the names of all his grandsons in the format shown in output samples. If he does not have any grandchildren just print “Get your sons married first! Wanna_be_grandpa!!” You can assume the input will always be a key from the dictionary. But we will check your code with a different dictionary. So do not write a code for this particular dictionary only. Enter Assume, you have been given a dictionary where the keys present the name of the father and…
7. group_friends_by_food For this problem, you are given a mostly-working version of the Friend and FriendsDB classes from hw6 and hw7, and we will add new method to FriendsDB -- group_friends_by_food. group_friends_by_food returns a dictionary mapping from each of the favorite foods enjoyed by any friend to a list of the friends who enjoy that food, sorted in alphabetical order. (You can use the friends_who_love method to generate these lists.) A sample run should look like this: |>>> friend1 = Friend ("sarah", 165) >>> friend1.add_favorite_food ("strawberries") >>> friend2 - Friend ("dweezil", 175) >>> friend2.add_favorite_food("pizza") >>> friend3 = Friend("bimmy", 60) >>> friend3.add_favorite_food("pizza") >>> friend3.add_favorite_food("strawberries") >>> db = FriendsDB() >>> db.add friend (friend1) >>> db.add_friend(friend2) >>> db.add friend(friend3) >>> db.group_friends_by_food() {'strawberries': ['bimmy', 'sarah'], 'pizza': [' bimmy', 'dweezil']}
Write the lines of code to insert the key (book's ISBN) and value ("book") pair into "my_hash_table".
Because of the nature of a set, the Set interface may be implemented using a variety of other collections or data structures. Describe how you would use a LinkedList to implement the Set interface. Discuss the advantages and disadvantages of this method.
We need a linked list to hold information about penguins in a zoo. You will need the following integers for your IntNode (see below). I have included sample values for one of the penguins: penguin ID: 45821 penguin weight (kg): 11 penguin height (cm): 90 We now need to track the number of penguins in the zoo. I would like to propose a better way to track the size of the list. Rather than traversing the list every time you need to know its size, why not keep a variable called listSize that increments every time you add a node to the list and decrements anytime you remove an item from the list? public class penguinList { //nested class IntNode goes here private IntNode first; private int listSize; //...the methods of penguinList class go here } Now, you just need to increment the listSize instance variable in every method that adds a node to the list. If you have any methods that removes a node from the list, decrement the listSize instance variable in those methods instead.…
In python: student_dict is a dictionary with students' name and pedometer reading pairs. A new student is read from input and added into student_dict. For each student in student_dict, output the student's name, followed by "'s pedometer reading: ", and the student's pedometer reading. Then, assign average_value with the average of all the pedometer readings in student_dict..
8. names_with_addresses It's time to mail out our form letters from homework 4! Given a friends database of the following shape (a list of dictionaries), return a list of tuples of friends names with their addresses, in the same order they are given in the input list. friends_database = [ {"name":"bimmy", "height":600, "address" :"in the woods"}, {"name":"Dweezil", "height": 175, "address":"123 Main Street"}, {"name":"Emily", "height": 190, "address":"7070 Willow Lane"} Keep in mind that your function should work with any friends database, not just this example one! It's passed as a parameter! Sample calls should look like this: >> names_with_addresses (friends_database) [('bimmy', 'in the woods'), ('Dweezil', '123 Main Street'), ('Emily', '7070 Willow Lane')] >>> names_with_addresses ([]) []
7. group_friends_by_food For this problem, you are given a mostly-working version of the Friend and FriendsDB classes from hw6 and hw7, and we will add new method to FriendsDB -- group_friends_by_food. group_friends_by_food returns a dictionary mapping from each of the favorite foods enjoyed by any friend to a list of the friends who enjoy that food, sorted in alphabetical order. (You can use the friends_who_love method to generate these lists.) A sample run should look like this: >>> friend1 = Friend("sarah", 165) >>> friend1.add favorite_food("strawberries") >>> friend2 Friend("dweezil", 175) >>> friend2.add_favorite_food("pizza") >>> friend3 Friend("bimmy", 60) >>> friend3.add_favorite_food("pizza") >>> friend3.add favorite_food ("strawberries") >>> db FriendsDB() %3D >>> db.add_ friend(friend1) >>> db.add_friend(friend2) >>> b.add_friend (friend3) >>> db.group_friends_by_food() {'strawberries': ['bimmy', 'sarah'], 'pizza': ['bimmy', 'dweezil']}