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team_2_week_3 #28

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efc4682
Add library management system with book classes
yunusdonmez-dev Oct 25, 2025
e156119
Add classes for Rectangle, School, Vehicle, and Customer
yunusdonmez-dev Oct 25, 2025
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296 changes: 296 additions & 0 deletions team_2_library.py
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Original file line number Diff line number Diff line change
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import json
import os

class Book():

def __init__(self, title, author, publication_year):
self.title = title
self.author = author
self.publication_year = publication_year
self.is_borrowed = False #False=kitap kutuphanede. True=kitap alinmis. False ile baslar
self.borrowed_by = None #basta kimse kitap almadigi icin None ile baslatilir. Biri aldiysa ismi yazilir

def show_info(self):
status = "Borrowed" if self.is_borrowed else "Available"
print("Book Info")
print("Title :", self.title)
print("Author:", self.author)
print("Year :", self.publication_year)
print("Status:", status)


def borrow(self, user):
if not self.is_borrowed: #kitap kimse tarafindan alinmamissa, musaitse
self.is_borrowed = True
self.borrowed_by = user.name
user.borrowed_books.append(self.title) #basligi ekliyor
print(f"{user.name} borrowed '{self.title}'.")
else: #musait degilse kimin aldigini soyler
print(f"'{self.title}' is already borrowed by {self.borrowed_by}.")

def return_book(self,user):
if self.is_borrowed and self.borrowed_by == user.name: #kitap biri tarafinda alinmissa
self.is_borrowed = False #kitap kutuphaneye geri dondu
self.borrowed_by = None #artik bir kullanicida degil
user.borrowed_books.remove(self.title)
print(f"'{user.name}' has successfully returned '{self.title}'.")

elif not self.is_borrowed:
print(f"'{self.title}' is already in the library.")

else:
print(f"'{self.title}' was borrowed by another user.")


def to_dict(self): # Kitap bilgisini JSON'a uygun hale getirir.
return {
"title": self.title,
"author": self.author,
"publication_year": self.publication_year,
"is_borrowed": self.is_borrowed,
"borrowed_by": self.borrowed_by
}


#-----------------------------------------------

class Novel(Book):
def __init__(self, title, author, publication_year, genre):
super().__init__(title, author, publication_year) #book sinifinin __init__ methodunu cagirir
self.genre = genre #genre= tur demek

def to_dict(self):
data = super().to_dict() #book daki to_dict cagirilir
data["genre"] = self.genre
return data


class Magazine(Book):
def __init__(self, title, author, publication_year, issue):
super().__init__(title, author, publication_year)
self.issue = issue

def to_dict(self):
data = super().to_dict()
data["issue"] = self.issue
return data

#--------------------------------


class User():
def __init__(self, name, password):
self.name = name
self.password = password
self.borrowed_books = []

def borrow_book(self,book):
book.borrow(self)

def return_book(self,book):
book.return_book(self)

def list_borrowed_books(self):
print(f"Borrowed books of user '{self.name}': ")
if not self.borrowed_books:
print(" No borrowed books.")
else:
for title in self.borrowed_books:
print(f" - {title}")

def to_dict(self):
return {
"name": self.name,
"password": self.password,
"borrowed_books": self.borrowed_books
}

#--------------------------

class Library():
def __init__(self, name):
self.name = name
self.books = []
self.users = []

def add_book(self,book):
self.books.append(book)
print(f"Book '{book.title}' added to the library.")


def add_user(self, user):
self.users.append(user)
print(f"User '{user.name}' added to the library '{self.name}'.")


def show_all_books(self):
print(f"{self.name} - All Books: ")
if not self.books:
print("No books in de library yet.")

else:
for book in self.books:
book.show_info()

def login(self, name, password):
for user in self.users:
if user.name == name and user.password == password:
print(f"Welcome, {name}!")
return user
print("Invalid username or password.")
return None

#----------------------------
#json a kaydetme ve yukleme

def save(self, filename="library_data.json"):
data = {
"name": self.name, #kutuphanenin adi
"books": [book.to_dict() for book in self.books], #self.books içindeki her book nesnesi için book.to_dict() çağrılır.
"users": [user.to_dict() for user in self.users]
}
with open(filename, "w", encoding="utf-8") as f:
json.dump(data, f, indent=4)
print(f"Library data saved to '{filename}'.")



def load(self, filename="library_data.json"): #kaydedilmis veriyi geri yukler (self nesnesine) yeniden kullanima sokar
if not os.path.exists(filename):
print("No saved data found.")
return
with open(filename, "r", encoding="utf-8") as f:
data = json.load(f) #json.load(f) ile JSON formatındaki veri Python sözlüğüne (dict) çevrilir.

self.name = data["name"] #kutuphanenin adi self.name olarak ayarlanir

#Kitapları (books) Yeniden Oluşturma
self.books = []
for b in data["books"]:
if "genre" in b:
book = Novel(b["title"], b["author"], b["publication_year"], b["genre"])
elif "issue" in b:
book = Magazine(b["title"], b["author"], b["publication_year"], b["issue"])
else:
book = Book(b["title"], b["author"], b["publication_year"])
book.is_borrowed = b["is_borrowed"] #kitap oduncte mi
book.borrowed_by = b["borrowed_by"] #kim odunc aldi
self.books.append(book)

self.users = []
for u in data["users"]:
user = User(u["name"], u["password"])
user.borrowed_books = u["borrowed_books"]
self.users.append(user)

def exit(self):
print('Thanks for using')
self.save()


#ana menu
def main():
library = Library("My Library")
library.load() # JSON varsa eski verileri yükle

print("---Welcome to the Library System---")

# Login veya yeni hesap oluşturma
user = None #henuz giris yapmis bir kullanici yok
while not user: #kullanıcı başarılı şekilde giriş yapana kadar döngü devam eder.
print("1 - Log in")
print("2 - Create new account")
print("3 - Add book")
choice = input("Choose an option: ")

if choice == "1":
name = input("Username: ")
password = input("Password: ")
user = library.login(name, password)
elif choice == "2": #yeni hesap olusturma
name = input("Choose a username: ")
password = input("Choose a password: ")
new_user = User(name, password)
library.add_user(new_user)
user = new_user
elif choice == "3": #yeni hesap olusturma
print("1 -Standart")
print("2 -Novel")
print("3 -Magazine")
genre = int(input("Choose the genre of the book: "))
if genre == 1:
title = input("Title: ")
author = input("Author: ")
publication_year = int(input("Publication_year: "))

book = Book(title, author, publication_year)
library.add_book(book)
print("Book is added.")
library.save()
elif genre == 2:
title = input("Title: ")
author = input("Author: ")
publication_year = int(input("Publication_year: "))
book_genre = 'Novel'
book = Novel(title, author, publication_year, book_genre)
library.add_book(book)
print("Book is added.")
library.save()
elif genre == 3:
title = input("Title: ")
author = input("Author: ")
publication_year = int(input("Publication_year: "))
book_genre = 'Magazine'
book = Magazine(title, author, publication_year, book_genre)
library.add_book(book)
print("Book is added.")
library.save()
else:
print("Invalid choice. Try again.")


while True:
print(f"=== Library Menu ({user.name}) ===")
print("1 - List all books")
print("2 - Borrow a book")
print("3 - Return a book")
print("4 - Show my borrowed books")
print("5 - Save and exit")

choice = input("Select an option: ")

if choice == "1":
library.show_all_books()

elif choice == "2":
title = input("Enter the title of the book to borrow: ")
for book in library.books:
if book.title.lower() == title.lower():
user.borrow_book(book) #kitap kutuphanede bulursa kullaniciya eklenir
break
else:
print("Book not found.")

elif choice == "3":
title = input("Enter the title of the book to return: ")
for book in library.books:
if book.title.lower() == title.lower():
user.return_book(book) #kitap kullanici listesinden silinir
break
else:
print("Book not found.")

elif choice == "4":
user.list_borrowed_books()

elif choice == "5":
library.exit()
break

else:
print("Invalid option. Try again.")


if __name__ == "__main__":

main()
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