python图书管理系统用csv文件储存图书信息并对一储存的图书信息进行增删查改，插入和遍历

好的，下面我来为您介绍如何编写一个基于 CSV 文件的图书管理系统。

首先，我们需要定义一些 CSV 文件中的列名，例如：书名、作者、出版社、ISBN 码等。假设我们使用以下列名：

book_name, author, publisher, isbn

然后，我们可以编写一个 Book 类来表示图书：

class Book:
    def __init__(self, book_name, author, publisher, isbn):
        self.book_name = book_name
        self.author = author
        self.publisher = publisher
        self.isbn = isbn

接下来，我们需要编写一个 CsvManager 类来管理 CSV 文件。这个类需要实现以下功能：

- 从 CSV 文件中读取图书信息
- 向 CSV 文件中写入图书信息
- 根据 ISBN 码查询图书信息
- 根据 ISBN 码删除图书信息
- 遍历所有图书信息

import csv

class CsvManager:
    def __init__(self, file_path):
        self.file_path = file_path
        self.fieldnames = ['book_name', 'author', 'publisher', 'isbn']

    def read_books(self):
        books = []
        with open(self.file_path, 'r') as f:
            reader = csv.DictReader(f, fieldnames=self.fieldnames)
            for row in reader:
                book = Book(row['book_name'], row['author'], row['publisher'], row['isbn'])
                books.append(book)
        return books

    def write_book(self, book):
        with open(self.file_path, 'a') as f:
            writer = csv.DictWriter(f, fieldnames=self.fieldnames)
            writer.writerow({'book_name': book.book_name, 'author': book.author, 'publisher': book.publisher, 'isbn': book.isbn})

    def find_book_by_isbn(self, isbn):
        with open(self.file_path, 'r') as f:
            reader = csv.DictReader(f, fieldnames=self.fieldnames)
            for row in reader:
                if row['isbn'] == isbn:
                    return Book(row['book_name'], row['author'], row['publisher'], row['isbn'])
        return None

    def delete_book_by_isbn(self, isbn):
        books = []
        with open(self.file_path, 'r') as f:
            reader = csv.DictReader(f, fieldnames=self.fieldnames)
            for row in reader:
                if row['isbn'] != isbn:
                    book = Book(row['book_name'], row['author'], row['publisher'], row['isbn'])
                    books.append(book)
        with open(self.file_path, 'w') as f:
            writer = csv.DictWriter(f, fieldnames=self.fieldnames)
            writer.writeheader()
            for book in books:
                writer.writerow({'book_name': book.book_name, 'author': book.author, 'publisher': book.publisher, 'isbn': book.isbn})

    def traverse_books(self):
        with open(self.file_path, 'r') as f:
            reader = csv.DictReader(f, fieldnames=self.fieldnames)
            for row in reader:
                book = Book(row['book_name'], row['author'], row['publisher'], row['isbn'])
                print(book.book_name, book.author, book.publisher, book.isbn)

最后，我们可以编写一个 Menu 类来提供一个简单的命令行菜单，用于调用 CsvManager 类的各种方法：

class Menu:
    def __init__(self, csv_manager):
        self.csv_manager = csv_manager

    def display_menu(self):
        print('1. Add book')
        print('2. Find book')
        print('3. Delete book')
        print('4. Traverse books')
        print('0. Exit')

    def run(self):
        while True:
            self.display_menu()
            choice = input('Enter your choice: ')
            if choice == '1':
                book_name = input('Enter book name: ')
                author = input('Enter author: ')
                publisher = input('Enter publisher: ')
                isbn = input('Enter ISBN: ')
                book = Book(book_name, author, publisher, isbn)
                self.csv_manager.write_book(book)
            elif choice == '2':
                isbn = input('Enter ISBN: ')
                book = self.csv_manager.find_book_by_isbn(isbn)
                if book:
                    print(book.book_name, book.author, book.publisher, book.isbn)
                else:
                    print('Book not found')
            elif choice == '3':
                isbn = input('Enter ISBN: ')
                self.csv_manager.delete_book_by_isbn(isbn)
            elif choice == '4':
                self.csv_manager.traverse_books()
            elif choice == '0':
                break

现在，我们可以在主函数中创建 CsvManager 和 Menu 对象，并调用 Menu 的 run 方法来启动图书管理系统：

if __name__ == '__main__':
    csv_manager = CsvManager('books.csv')
    menu = Menu(csv_manager)
    menu.run()

这样，一个基于 CSV 文件的图书管理系统就完成了。