Library-Management-System/Library_Management_System at main · mothishya/Library-Management-System · GitHub

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import pandas as pd
import os

# ============================
#  LOAD OR CREATE DATABASE FILES
# ============================

def load_csv(file, columns):
    if os.path.exists(file):
        return pd.read_csv(file)
    else:
        df = pd.DataFrame(columns=columns)
        df.to_csv(file, index=False)
        return df

books = load_csv("books.csv", ["Book_ID", "Title", "Author", "Quantity"])
students = load_csv("students.csv", ["Student_ID", "Student_Name"])
issue_records = load_csv("issue_records.csv", ["Book_ID", "Student_ID", "Status"])

# ============================
#  SAVE ALL CHANGES
# ============================

def save_data():
    books.to_csv("books.csv", index=False)
    students.to_csv("students.csv", index=False)
    issue_records.to_csv("issue_records.csv", index=False)

# ============================
#  ADD BOOK
# ============================

def add_book():
    try:
        book_id = input("Enter Book ID: ")
        title = input("Enter Book Title: ")
        author = input("Enter Author Name: ")
        qty = int(input("Enter Quantity: "))

        global books
        books.loc[len(books)] = [book_id, title, author, qty]
        save_data()
        print("\n✔ Book Added Successfully!\n")
    except:
        print("❌ Invalid input! Try again.")

# ============================
#  DISPLAY BOOKS
# ============================

def display_books():
    if books.empty:
        print("No books available.\n")
    else:
        print("\n------ BOOK LIST ------")
        print(books)
        print()

# ============================
#  SEARCH BOOK
# ============================

def search_book():
    key = input("Search by ID or Title: ").lower()
    result = books[
        (books["Book_ID"].astype(str).str.lower() == key) |
        (books["Title"].str.lower().str.contains(key))
    ]

    if result.empty:
        print("❌ Book Not Found!\n")
    else:
        print("\n✔ Book Found:")
        print(result)
        print()

# ============================
#  ISSUE BOOK
# ============================

def issue_book():
    b_id = input("Enter Book ID: ")
    s_id = input("Enter Student ID: ")

    # Check book exists
    book_row = books[books["Book_ID"] == b_id]
    if book_row.empty:
        print("❌ Book ID not found!")
        return

    # Check quantity
    qty = int(book_row["Quantity"].values[0])
    if qty <= 0:
        print("❌ Book is currently unavailable!")
        return

    # Issue book
    global issue_records
    issue_records.loc[len(issue_records)] = [b_id, s_id, "Issued"]
    books.loc[books["Book_ID"] == b_id, "Quantity"] = qty - 1

    save_data()
    print("\n✔ Book Issued Successfully!\n")

# ============================
#  RETURN BOOK
# ============================

def return_book():
    b_id = input("Enter Book ID: ")
    s_id = input("Enter Student ID: ")

    issued = issue_records[
        (issue_records["Book_ID"] == b_id) &
        (issue_records["Student_ID"] == s_id) &
        (issue_records["Status"] == "Issued")
    ]

    if issued.empty:
        print("❌ No record found for issued book!")
        return

    # Mark as returned
    issue_records.loc[issued.index, "Status"] = "Returned"

    # Increase book quantity
    books.loc[books["Book_ID"] == b_id, "Quantity"] += 1

    save_data()
    print("\n✔ Book Returned Successfully!\n")

# ============================
#  MAIN MENU
# ============================

def menu():
    while True:
        print("\n=========== LIBRARY MANAGEMENT SYSTEM ===========")
        print("1. Add Book")
        print("2. Display Books")
        print("3. Search Book")
        print("4. Issue Book")
        print("5. Return Book")
        print("6. Exit")

        choice = input("Enter your choice: ")

        if choice == "1":
            add_book()
        elif choice == "2":
            display_books()
        elif choice == "3":
            search_book()
        elif choice == "4":
            issue_book()
        elif choice == "5":
            return_book()
        elif choice == "6":
            print("Exiting Program...")
            break
        else:
            print("❌ Invalid choice! Please try again.")

# Run the menu
menu()