PYTHON!! thanks! suppose theres a class called books and a class called Patron a
ID: 3573689 • Letter: P
Question
PYTHON!! thanks!
suppose theres a class called books and a class called Patron and a class called library
how would i complete these two functions
1) return_book(self, library, book_id) :: patron asks the Library to reshelve this book. (call a method form the library parameter and let it do the reshelving). o Returns True when the book was successfully returned, and False if the process couldn't be completed for any reason (and don't modify the library or patron when False is returned). o exceptions might be raised via code from the Library class; you must catch them and return False, making no modifications to the library or patron. (which would these be? How will you deal with them?)
2) check_out_book_by_id(self, library, book_id) :: patron asks the Library to lend the Book with that id#. (call a method of the library parameter to request the given book). o Returns True when the book was successfully checked out, and False in all other instances (not modifying the original library or this patron). o Don't worry about multiple matches.
Explanation / Answer
This depends on the implementation of the Library and the Book class.
The classes must be something like this:
class Book:
id = 0
name = ''
def __init__(id, name):
self.id = id
self.name = name
class Library:
id = 0
books = []
def __init__(id, books=[]):
self.id = id
self.books = books
Methods
def return_book(self, library, book_id):
try:
library.books.append(book_id)
return True
except e:
return False
def check_out_book_by_id(self, library, book_id):
if book_id in library.books:
library.books.remove(book_id)
return True
else:
return False
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