3. Give FriendsDB a new method for finding friends by their favorite food. Add a method friends_who_love(food), which returns a sorted list of all of the friends in the FriendsDB who have a specified favorite food in their set of favorite foods. Is this a good place to use a list comprehension for style points?? Sample usage should look like: >>> friend1 = Friend("sarah", 165) >> friend1.add_favorite_food("strawberries") >> friend1.add_favorite_food("falafel") >>> friend2 = Friend("dweezil", 175) >> friend2.add_favorite_food("pizza") >>> friend3 = Friend("eliza", 170) > friend4 = Friend("bimmy", 60) >» friend4.add_favorite_food("falafel")

3. Give FriendsDB a new method for finding friends by their favorite food. Add a method friends_who_love(food), which returns a sorted list of all of the friends in the FriendsDB who have a specified favorite food in their set of favorite foods. Is this a good place to use a list comprehension for style points?? Sample usage should look like: >>> friend1 = Friend("sarah", 165) >> friend1.add_favorite_food("strawberries") >> friend1.add_favorite_food("falafel") >>> friend2 = Friend("dweezil", 175) >> friend2.add_favorite_food("pizza") >>> friend3 = Friend("eliza", 170) > friend4 = Friend("bimmy", 60) >» friend4.add_favorite_food("falafel")

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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You will also have to write Student Tests that test the following in the provided file.i. Adding element(s).ii. Get elements at index – (1) with a valid index and (2) with an invalid indexiii. Test equality of two StringArrayLists (of size 0, 2)iv. Test if a StringArrayList contains a String (test both true and false cases)v.Test removing a String from a StringArrayList.
def upgrade_stations(threshold: int, num_bikes: int, stations: List["Station"]) -> int: """Modify each station in stations that has a capacity that is less than threshold by adding num_bikes to the capacity and bikes available counts. Modify each station at most once. Return the total number of bikes that were added to the bike share network. Precondition: num_bikes >= 0
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Question 9 Suppose title is the doubly-linked list object pictured below: current head Which lines of code would be necessary to correctly execute the method call title.remove (3)? Select all that apply. O current.next - current.next.next current.next = null O current.next.previous = current.previous current.previous.next = current.next current.previous = null
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.…
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7- question What keys and values are contained in the following map after execution of the following piece of code? Map map = new HashMap (); map.put (8, "Eight"); map.put (41, "Forty-one"); map.put (8, "Ocho"); map.put (18, "Eighteen"); map.put (50, "Fifty"); map.put (132, "OneThreeTwo"); map.put (28, "Twenty-eight"); map.put (79, "Seventy-nine"); map.remove ( 41); map.remove (28); map.put (28, "18"); map.remove (18); a. {8=Eight, 41=Forty-one, 8=0cho, 18=Eighteen, 50=Fifty, 132=OneThreeTwo, 28=Twenty-eight, 79=Seventy-nine, 28=18} b. {8=Eight, 8=Ocho, 50=Fifty, 132=OneThreeTwo, 79=Seventy-nine, 28=18} c. {50=Fifty, 132=DOneThreeTwo, 8=Ocho, 28=18, 79=Seventy-nine} d. {8=Eight, 50=Fifty, 132=OneThreeTwo, 79=Seventy-nine, 28=18}
Complete the docstring using the information attached (images):def upgrade_stations(threshold: int, num_bikes: int, stations: List["Station"]) -> int: """Modify each station in stations that has a capacity that is less than threshold by adding num_bikes to the capacity and bikes available counts. Modify each station at most once. Return the total number of bikes that were added to the bike share network. Precondition: num_bikes >= 0 >>> handout_copy = [HANDOUT_STATIONS[0][:], HANDOUT_STATIONS[1][:]] >>> upgrade_stations(25, 5, handout_copy) 5 >>> handout_copy[0] == HANDOUT_STATIONS[0] True >>> handout_copy[1] == [7001, 'Lower Jarvis St SMART / The Esplanade', \ 43.647992, -79.370907, 20, 10, 10] True """
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