Everything must be in Python syntax, Thanks You will be implementing a Library system similar to the ones you see on Netflix, Amazon, or Barnes Noble Your Library class will read a set of reader ratings for a set of books and provide functions methods to analyze the data and suggest new books for a given reader As in Homework 7, you will need to put all your knowledge together into solving a real world problem We will provide you with a test data set with which you can test your code, but your grade for your assignment will be based on processing a different data set You will not know the exact data being used, but will be told the purpose of each test case and the outcome Data Files used in your Library System There are two files that are used in this assignment a list of books (books txt) and a list of ratings from readers (ratings txt) There are ratings associated with each book in the books file for each reader The order of the ratings by an individual reader is the same as the order of the books in the books txt data file The input files will always be named books txt and ratings txt (i e , You can hardcode these names into your program ) Load your book data and user data from these files Format of books txt Every non empty line of books txt will have the following format , For example Douglas Adams,The Hitchhiker's Guide To The Galaxy Richard Adams,Watership Down Mitch Albom,The Five People You Meet in Heaven Laurie Halse Anderson,Speak Maya Angelou,I Know Why the Caged Bird Sings Book data should be case insensitive Convert all titles and author names to lowercase before assigning them to the member data for the Book objects For example Douglas Adams,The Hitchhiker's Guide To The Galaxy should become douglas adams,the hitchhiker's guide to the galaxy Format of ratings txt Every line of ratings txt will have the following format a row with the user's name, followed by a comma, followed by this user's ratings for all books Username and ratings are separated by comma, and each rating is separated by a single space , The number of ratings a user has will always be equal to the number of books For example, if there were 5 books in books txt, every user will have 5 ratings in ratings txt Convert names to lowercase before creating the User object For example, Ben should become ben For example The ratings txt will look like Ben,5 0 0 0 0 Moose Potter,5 5 0 0 0 Reuven ravenclaw,5 5 0 0 0 The i t h rating for each user in ratings txt corresponds to the i t h book in books txt In this example, a user's second rating is always for the Watership Down Rating System Rating Meaning 0 Havent read it 5 Hated it 3 Didnt like it 1 Ok neither hot nor cold about it 3 Liked it 5 Really liked it Create a class Library Each part of the remaining writeup depends on methods from the previous step working correctly This strategy of writing a little bit of code and testing it, then adding more functionality and testing it, is known as a bottom up implementation strategy It builds the base (most fundamental) functions and methods first, then adds new layers of complexity that takes advantage of the methods already tested By implementing and testing each layer independently, you isolate the possible places where problems can occur and makes the debugging process easier Final Note When writing your functions and class methods, you will need to write code that tests those methods You can place your testing code anywhere in your python source file, however we suggest that you create a my tests() function similar to how you added your test code into a main function in a C source file Although Python does not explicitly call that function for you, you can mimic that behavior by placing a call to my tests() at the bottom of your source file Library Class You need to create a class Library Instance Variables book list list to store the books read from file user dictionary a python dictionary which stores the users and their ratings for the books Class Methods constructor provide a constructor that takes two filenames (books filename, ratings filename) as parameters and creates the required dictionaries and lists as class data members read books(file name) method should add entries to a member list variable for books from the file read users(user file name) method should add entries to a member dictionary variable for ratings from the file After the data is loaded, print the following Data Loaded successfully You will also provide other methods as described below to provide the recommendations of books to read for a given user Part A Write a method login() After the data is loaded, welcome the user to the library and ask them to enter their name Welcome to the Library, What is your name If a user has interacted with the system before, the system should remember the user's previous ratings Login should be case insensitive Convert all logins to lowercase before searching for the user If a user ben or Ben was in the array of users, all of the following logins should be successful Ben, BeN, BEN, ben etc Keep in mind the user might make mistakes Your program should account for user error at any step For example, if upon asking the user to entering their name, the user accidentally presses ENTER, your program should recognize the fact that the input is basically empty and prompt the user to enter their name again If it is a user's first time interacting with the system, they should be added to the user dictionary of the class As the user hasnt rated any book yet, the ratings for all the books will be 0 Part B Write a method menu() which provides the user a menu of options The menu should look like the following After the name is entered, the following options should be provided Would you like to (v)iew your ratings, (r)ate a book, (g)et recommendations, or (q)uit Part C Write a function, view ratings(current user name) which takes in the logged in user name and prints all the books and their ratings which have been read by the user Recall that a rating of 0 means a user has not rated that book and hence shouldnt be displayed Here is an example of how to display the users rating values Part D Write a function rate book(current user name, book name, rating) which takes in the logged in user name, the book name that user wants to rate and the rating of that book If the user chooses to rate a book, the user will be prompted first to enter the title of the book Keep in mind that we will treat the used input as case insensitive All of the following user input values should be successful Ender's Game ender's game ENDERS GAME Ender's GAME If the title of the book already exists in the system, then the user will be asked to provide the rating value If the title does not exists, prompt the user to enter a new title Even if the user has already rated a book, they should be able to enter a new rating value This will result in an update of the ratings array for the user Note You might want to make a helper function to find the index of the book Here is an example of the dialog with the user If the book doesnt exist in your Library, or if the user presses ENTER accidentally, then print an error message, like below Part E Write a Helper method calc similarity(user1, user2) which takes 2 user ids to find and return the similarity between all of the ratings of the two given users This method is similar to the method used in the DNA assignment, as it compares the individual ratings from the two users to determine the overall similarity between two users The similarity between two users is calculated by treating each of their ratings as a mathematical vector and calculating the dot product of these two vectors (Remember that the dot product is just the sum of the products of each of the corresponding elements See the example below ) For example, suppose we had 3 books and ratings as follows Terry 5 3 1 Bob 5 1 5 The calculation for similarity between Terry and Bob will be Terry and Bob (5 5)2 (3 1)2 (1 5)2 0 4 16 20 Part F Write a function get most similar user(current user name) which takes a current user nme and returns the user name of user whose similarity score with the current user name is the lowest This method will look through the other users in the dictionary to find the user whose ratings are the most similar to the current user name s ratings If 2 users have same (lowest) similarity score, return the first one For example, suppose we had 3 books and ratings as follows Terry 5 3 1 Bob 5 1 5 Tracey 1 5 3 Kalid 1 3 0 The calculation for similarity between Terry and all other users will be Terry and Bob Terry and Tracey Terry and Kalid (5 5)2 (3 1)2 (1 5) 2 0 4 16 20 (5 1) 2 (3 5)2 (1 3)2 16 4 4 (5 1)2 (3 3)2 (1 0)2 16 0 1 17 24 Once you have calculated the pairwise similarity between Terry and every other user, you can then identify whose ratings are most similar to Terrys In this case, Kalid is most similar to Terry Part G Write a function recommend books(current user name) to find a set of recommendations of new books to read for a given user name The function will print a set of recommendations in a list This function should recommend at most 10 recommended books If there are less than 10 books to recommend, recommend as many as possible So user will be presented with 0 to 10 recommendations This method should use the methods already described above to find the most similar user to the current user name The method will recommend all the books that the similar user has rated as a 3 or 5 thatthe current user name has not read yet Remember, if a user has not given any rating for a book that means they have not read that book yet For the data currently in ratings txt, there are no books to recommend for cust1 For the data currently in ratings txt , there are five book recommendations for Jim C

Question

Everything must be in Python   syntax, Thanks  You will be implementing a Library system similar to the ones you see on Netflix, Amazon, or Barnes   Noble  Your Library class will read a set of reader ratings for a set of books and provide functions methods to analyze the data and suggest new books for a given reader  As in Homework 7, you will need to put all your knowledge together into solving a real world problem  We will provide you with a test data set with which you can test your code, but your grade for your assignment will be based on processing a different data set  You will not know the exact data being used, but will be told the purpose of each test case and the outcome  Data Files used in your Library System There are two files that are used in this assignment  a list of books (books txt) and a list of ratings from readers (ratings txt)  There are ratings associated with each book in the books file for each reader  The order of the ratings by an individual reader is the same as the order of the books in the books txt data file  The input files will always be named books txt and ratings txt  (i e , You can hardcode these names into your program ) Load your book data and user data from these files  Format of books txt Every non empty line of books txt will have the following format  , For example  Douglas Adams,The Hitchhiker's Guide To The Galaxy Richard Adams,Watership Down Mitch Albom,The Five People You Meet in Heaven Laurie Halse Anderson,Speak Maya Angelou,I Know Why the Caged Bird Sings Book data should be case insensitive  Convert all titles and author names to lowercase before assigning them to the member data for the Book objects  For example  Douglas Adams,The Hitchhiker's Guide To The Galaxy should become douglas adams,the hitchhiker's guide to the galaxy Format of ratings txt Every line of ratings txt will have the following format  a row with the user's name, followed by a comma, followed by this user's ratings for all books  Username and ratings are separated by comma, and each rating is separated by a single space  ,     The number of ratings a user has will always be equal to the number of books  For example, if there were 5 books in books txt, every user will have 5 ratings in ratings txt  Convert names to lowercase before creating the User object  For example,  Ben  should become  ben   For example  The ratings txt will look like Ben,5 0 0 0 0 Moose Potter,5 5 0 0 0 Reuven ravenclaw,5  5 0 0 0 The i t h rating for each user in ratings txt corresponds to the i t h book in books txt   In this example, a user's second rating is always for the Watership Down  Rating System  Rating Meaning 0 Havent read it  5 Hated it  3 Didnt like it 1 Ok  neither hot nor cold about it 3 Liked it  5 Really liked it  Create a class Library Each part of the remaining writeup depends on methods from the previous step working correctly  This strategy of writing a little bit of code and testing it, then adding more functionality and testing it, is known as a bottom up implementation strategy  It builds the base (most fundamental) functions and methods first, then adds new layers of complexity that takes advantage of the methods already tested  By implementing and testing each layer independently, you isolate the possible places where problems can occur and makes the debugging process easier  Final Note When writing your functions and class methods, you will need to write code that tests those methods  You can place your testing code anywhere in your python source file, however we suggest that you create a my tests() function similar to how you added your test code into a main function in a C   source file  Although Python does not explicitly call that function for you, you can mimic that behavior by placing a call to my tests() at the bottom of your source file  Library Class You need to create a class Library   Instance Variables    book list   list to store the books read from file    user dictionary  a python dictionary which stores the users and their ratings for the books  Class Methods   constructor  provide a constructor that takes two filenames (books filename, ratings filename) as parameters and creates the required dictionaries and lists as class data members    read books(file name) method should add entries to a member list variable for books from the file    read users(user file name) method should add entries to a member dictionary variable for ratings from the file  After the data is loaded, print the following  Data Loaded successfully  You will also provide other methods as described below to provide the recommendations of books to read for a given user  Part A Write a method login()   After the data is loaded, welcome the user to the library and ask them to enter their name Welcome to the Library, What is your name   If a user has interacted with the system before, the system should remember the user's previous ratings  Login should be case insensitive  Convert all logins to lowercase before searching for the user  If a user  ben  or  Ben  was in the array of users, all of the following logins should be successful  Ben, BeN, BEN, ben etc  Keep in mind the user might make mistakes  Your program should account for user error at any step  For example, if upon asking the user to entering their name, the user accidentally presses ENTER, your program should recognize the fact that the input is basically empty and prompt the user to enter their name again  If it is a user's first time interacting with the system, they should be added to the user dictionary of the class  As the user hasnt rated any book yet, the ratings for all the books will be 0  Part B Write a method menu() which provides the user a menu of options  The menu should look like the following  After the name is entered, the following options should be provided  Would you like to (v)iew your ratings, (r)ate a book, (g)et recommendations, or (q)uit   Part C Write a function, view ratings(current user name) which takes in the logged in user name and prints all the books and their ratings which have been read by the user  Recall that a rating of 0 means a user has not rated that book and hence shouldnt be displayed  Here is an example of how to display the users rating values  Part D Write a function rate book(current user name, book name, rating) which takes in the logged in user name, the book name that user wants to rate and the rating of that book  If the user chooses to rate a book, the user will be prompted first to enter the title of the book  Keep in mind that we will treat the used input as case insensitive  All of the following user input values should be successful    Ender's Game   ender's game   ENDERS GAME   Ender's GAME If the title of the book already exists in the system, then the user will be asked to provide the rating value  If the title does not exists, prompt the user to enter a new title  Even if the user has already rated a book, they should be able to enter a new rating value  This will result in an update of the ratings array for the user  Note  You might want to make a helper function to find the index of the book  Here is an example of the dialog with the user  If the book doesnt exist in your Library, or if the user presses ENTER accidentally, then print an error message, like below  Part E Write a Helper method calc similarity(user1, user2) which takes 2 user ids to find and return the similarity between all of the ratings of the two given users  This method is similar to the method used in the DNA assignment, as it compares the individual ratings from the two users to determine the overall similarity between two users  The similarity between two users is calculated by treating each of their ratings as a mathematical vector and calculating the dot product of these two vectors  (Remember that the dot product is just the sum of the products of each of the corresponding elements  See the example below ) For example, suppose we had 3 books and ratings as follows  Terry 5 3 1 Bob 5 1 5 The calculation for similarity between Terry and Bob will be    Terry and Bob  (5   5)2  (3   1)2  (1   5)2  0   4   16   20 Part F Write a function get most similar user(current user name) which takes a current user nme and returns the user name of user whose similarity score with the current user name is the lowest  This method will look through the other users in the dictionary to find the user whose ratings are the most similar to the current user name s ratings  If 2 users have same (lowest) similarity score, return the first one  For example, suppose we had 3 books and ratings as follows  Terry 5 3 1 Bob 5 1 5 Tracey 1 5 3 Kalid 1 3 0 The calculation for similarity between Terry and all other users will be    Terry and Bob    Terry and Tracey   Terry and Kalid  (5   5)2  (3  1)2  (1   5) 2 0  4 16   20 (5  1) 2  (3   5)2  (1   3)2  16   4   4 (5   1)2  (3   3)2  (1   0)2 16   0  1   17  24 Once you have calculated the pairwise similarity between Terry and every other user, you can then identify whose ratings are most similar to Terrys  In this case, Kalid is most similar to Terry  Part G Write a function recommend books(current user name) to find a set of recommendations of new books to read for a given user name  The function will print a set of recommendations in a list  This function should recommend at most 10 recommended books  If there are less than 10 books to recommend, recommend as many as possible  So user will be presented with 0 to 10 recommendations  This method should use the methods already described above to find the most similar user to the current user name  The method will recommend all the books that the similar user has rated as a 3 or 5 thatthe current user name has not read yet   Remember, if a user has not given any rating for a book that means they have not read that book yet  For the data currently in ratings txt, there are no books to recommend for cust1  For the data currently in ratings txt , there are five book recommendations for Jim C

SolutionInn · Accepted Answer

The Answer is in the image, click to view ...

Question: Everything must be in Python # syntax, Thanks! You will be implementing a Library system similar to the ones you see on Netflix, Amazon, or