Question

The first part is “addBook method” the Second part is “checkOut method” the third part is “isAvailable method” and the fourth is “__str__ method”. What you have to do is complete the sample code provided below. do not change the sample code and print result. The program's goal is to keep track of books in a library. Books are stored in dictionaries, with the book title as the key.

Source Code is:

class Library:
bookCount = 0

def __init__(self):
self.cardCatalog = dict()
self.checkedOut = dict()

# PART 1
  
# Add the book to cardCatalog. title is the key, author is the value
# Add the book to checkedOut. title is the key, False is the value
def addBook(self, author, title):
pass

# PART 2
#
# Check to see if the title is in checkedOut dictionary.
# If so, set the value to True
def checkOut(self, author, title):
pass

# PART 3
#
# Check to see if the title is in checkedOut.
# If it isn't return False
# If it is, and the value is True, return False
# If the value is False, return True
# (Note that it appears reversed. Being checked out means it's not available
def isAvailable(self, author, title):
pass

# PART 4
#
# Return a string that contains multiple lines.
# Each line is a title followed by the author name.
# Hint: Create a string and append title, name, and a newline "\n"
# then return the string
def __str__(self):
pass

#
# Code to test the program
#
# DO NOT CHANGE THE CODE BELOW.
#
# Your output should be:
# False
# A Fall of Moondust Arthur C. Clarke
# Pandora's Star Peter F. Hamilton
# Ringworld Larry Niven
# <blank line> <= No brackets, just one blank line, makes __str__ easier
#

lib = Library()

lib.addBook("Peter F. Hamilton", "Pandora's Star")
lib.addBook("Arthur C. Clarke", "A Fall of Moondust")
lib.addBook("Larry Niven", "Ringworld")
lib.checkOut("Peter F. Hamilton", "Pandora's Star")
print(lib.isAvailable("Hamilton", "Pandora's Star"))
print(lib)

Answer 1

PYTHON CODE:

class Library:
    bookCount = 0

    def __init__(self):

        self.cardCatalog = dict()
        self.checkedOut = dict()

    # PART 1
    
    # Add the book to cardCatalog. title is the key, author is the value
    # Add the book to checkedOut. title is the key, False is the value
    def addBook(self, author, title):

        self.cardCatalog[title]=author
        self.checkedOut[title]=False
      

    # PART 2
    #
    # Check to see if the title is in checkedOut dictionary.
    # If so, set the value to True
    def checkOut(self, author, title):

        for key in self.checkedOut.keys():

            if key == title:
                self.checkedOut[title]=True
                break
          

    # PART 3
    #
    # Check to see if the title is in checkedOut.
    # If it isn't return False
    # If it is, and the value is True, return False
    # If the value is False, return True
    # (Note that it appears reversed. Being checked out means it's not available
    def isAvailable(self, author, title):

        for key,value in self.checkedOut.items():

            if key == title and value == True:
                return False

            if key == title and value == False:
                return True
          

    # PART 4
    #
    # Return a string that contains multiple lines.
    # Each line is a title followed by the author name.
    # Hint: Create a string and append title, name, and a newline "\n"
    # then return the string
    def __str__(self):

        s = ''

        titles = sorted(self.cardCatalog.keys())

        for title in titles:

            for key,value in self.cardCatalog.items():

                if title == key:

                    s += key +' '+ value+'\n'
                    break

        return s
          

#
# Code to test the program
#
# DO NOT CHANGE THE CODE BELOW.
#
# Your output should be:
# False
# A Fall of Moondust Arthur C. Clarke
# Pandora's Star Peter F. Hamilton
# Ringworld Larry Niven
# <blank line> <= No brackets, just one blank line, makes __str__ easier
#

lib = Library()

lib.addBook("Peter F. Hamilton", "Pandora's Star")
lib.addBook("Arthur C. Clarke", "A Fall of Moondust")
lib.addBook("Larry Niven", "Ringworld")
lib.checkOut("Peter F. Hamilton", "Pandora's Star")
print(lib.isAvailable("Hamilton", "Pandora's Star"))
print(lib)

SCREENSHOT FOR CODING:

class Library: bookCount = 0 def __init__(self): self.cardCatalog = dict() self.checkedOut = dict() # PART 1 # Add the book to cardCatalog. title is the key, author is the value # Add the book to checkedOut. title is the key, False is the value def addBook (self, author, title) : self.cardCatalog[title]=author self.checkedOut[title]=False # PART 2 # # Check to see if the title is in checkedOut dictionary. # If so, set the value to True def checkout (self, author, title): for key in self.checkedout.keys (): if key =" title: self.checkedOut[title] =True break # PART 3 # # Check to see if the title is in checkedOut. # If it isn't return false # If it is, and the value is True, return False # If the value is False, return True (Note that it appears reversed. Being checked out means it's not available def isAvailable (self, author, title): for key, value in self.checkedOut.items(): if key == title and value == True: return false if key == title and value == False: return True # PART 4 # Return a string that contains multiple lines. # Each line is a title followed by the author name. # Hint: Create a string and append title, name, and a newline "\n" # then return the string def str (self): titles = sorted (self.cardCatalog.keys()) for title in titles: for key, value in self.cardCatalog.items(): if title == key: 3 += key +' ' + value+'\n' break return 3 # Code to test the program # # DO NOT CHANGE THE CODE BELOW. # # Your output should be: # False # A Fall of Moondust Arthur C. Clarke # Pandora's Star Peter F. Hamilton # Ringworld Larry Niven # <blank line> <= No brackets, just one blank line, makes # _str_easier lib - Library lib.addBook ("Peter F. Hamilton", "Pandora's Star") lib.addBook ("Arthur C. Clarke", "A Fall of Moondust") lib.addBook ("Larry Niven", "Ringworld") lib.checkOut ("Peter F. Hamilton", "Pandora's Star") print(lib.isAvailable ("Hamilton", "Pandora's Star")) print (lib)

SCREENSHOT FOR OUTPUT:

False A Fall of Moondust Arthur C. Clarke Pandora's Star Peter F. Hamilton Ringworld Larry Niven >>>