The following Book class demonstrates use of setters and getters methods. It is a common practice to make all of data attributes private and to provide public methods for accessing them.
The following program implements CRUD operations using list of objects having attributes.
# Define Book class
class Book:
def __init__(self, isbn, name, price):
self.__isbn = isbn
self.__name = name
self.__price = price
def set_isbn(self, isbn):
self.__isbn = isbn
def set_name(self, name):
self.__name = name
def set_price(self, price):
self.__price = price
def get_isbn(self):
return self.__isbn
def get_name(self):
return self.__name
def get_price(self):
return self.__price
def __str__(self):
return "ISBN:" + str(self.__isbn) + \
", Name:" + self.__name + \
", Price:" + str(self.__price)
# Creating and storing objects in list
books =[]
n = int(input('How many records you want to enter? '))
for i in range(n):
isbn = int(input('Enter ISBN number: '))
name = input('Enter book name: ')
price = int(input('Enter book price: '))
print() # print blank line
book = Book(isbn,name,price)
books.append(book)
# Display books details
print('Books detail:\n')
for book in books:
print('ISBN: ', book.get_isbn())
print('Name: ', book.get_name())
print('Price: ', book.get_price())
print()
# Search the book
isbn = int(input('Enter ISBN to search: '))
for book in books:
if book.get_isbn() == isbn:
print(book)
break
else:
print('Record not found')
# Delete the book
isbn = int(input('\nEnter ISBN to delete book: '))
for book in books:
if book.get_isbn() == isbn:
books.remove(book)
print('Record deleted')
break
else:
print('Record not found')
# Updating price of book
isbn = int(input('\nEnter ISBN to update price: '))
for book in books:
if book.get_isbn() == isbn:
new_price = int(input('Enter new price of book:'))
book.set_price(new_price)
print('Record updated')
break
else:
print('Record not found')
Output
How many records you want to enter? 3 Enter ISBN number: 8175255766 Enter book name: PyForSchool Computer Science Enter book price: 49 Enter ISBN number: 8123456790 Enter book name: PyForSchool Python Enter book price: 129 Enter ISBN number: 9876543210 Enter book name: Learn Python Enter book price: 350 Books detail: ISBN: 8175255766 Name: PyForSchool Computer Science Price: 49 ISBN: 8123456790 Name: PyForSchool Python Price: 129 ISBN: 9876543210 Name: Learn Python Price: 350 Enter ISBN to search: 8123456790 ISBN:8123456790, Name:PyForSchool Python, Price:129 Enter ISBN to delete book: 8123456790 Record deleted Enter ISBN to update price: 9876543210 Enter new price of book:200 Record updated