Python学校教材管理系统实现增删查改Python代码

以下是一个简单的Python学校教材管理系统的增删查改代码示例：

import os

class Textbook:
    def __init__(self, name, author, publisher):
        self.name = name
        self.author = author
        self.publisher = publisher

class TextbookManager:
    def __init__(self):
        self.textbooks = []

    def add_textbook(self, textbook):
        self.textbooks.append(textbook)

    def remove_textbook(self, name, author):
        for textbook in self.textbooks:
            if textbook.name == name and textbook.author == author:
                self.textbooks.remove(textbook)
                return True
        return False

    def search_textbook(self, name, author):
        for textbook in self.textbooks:
            if textbook.name == name and textbook.author == author:
                return textbook
        return None

    def update_textbook(self, old_name, old_author, new_textbook):
        for textbook in self.textbooks:
            if textbook.name == old_name and textbook.author == old_author:
                textbook.name = new_textbook.name
                textbook.author = new_textbook.author
                textbook.publisher = new_textbook.publisher
                return True
        return False

    def save_textbooks(self, filename):
        with open(filename, "w") as f:
            for textbook in self.textbooks:
                f.write("{},{},{}\n".format(textbook.name, textbook.author, textbook.publisher))

    def load_textbooks(self, filename):
        if not os.path.exists(filename):
            return
        with open(filename, "r") as f:
            lines = f.readlines()
            for line in lines:
                parts = line.strip().split(",")
                name = parts[0]
                author = parts[1]
                publisher = parts[2]
                self.add_textbook(Textbook(name, author, publisher))


def main():
    manager = TextbookManager()
    manager.load_textbooks("textbooks.txt")
    while True:
        print("1. Add Textbook")
        print("2. Remove Textbook")
        print("3. Search Textbook")
        print("4. Update Textbook")
        print("5. Save Textbooks")
        print("6. Exit")
        choice = input("Enter your choice: ")
        if choice == "1":
            name = input("Enter textbook name: ")
            author = input("Enter textbook author: ")
            publisher = input("Enter textbook publisher: ")
            manager.add_textbook(Textbook(name, author, publisher))
            print("Textbook added successfully!")
        elif choice == "2":
            name = input("Enter textbook name: ")
            author = input("Enter textbook author: ")
            if manager.remove_textbook(name, author):
                print("Textbook removed successfully!")
            else:
                print("Textbook not found!")
        elif choice == "3":
            name = input("Enter textbook name: ")
            author = input("Enter textbook author: ")
            textbook = manager.search_textbook(name, author)
            if textbook:
                print("Textbook found:")
                print("Name:", textbook.name)
                print("Author:", textbook.author)
                print("Publisher:", textbook.publisher)
            else:
                print("Textbook not found!")
        elif choice == "4":
            old_name = input("Enter old textbook name: ")
            old_author = input("Enter old textbook author: ")
            new_name = input("Enter new textbook name: ")
            new_author = input("Enter new textbook author: ")
            new_publisher = input("Enter new textbook publisher: ")
            new_textbook = Textbook(new_name, new_author, new_publisher)
            if manager.update_textbook(old_name, old_author, new_textbook):
                print("Textbook updated successfully!")
            else:
                print("Textbook not found!")
        elif choice == "5":
            manager.save_textbooks("textbooks.txt")
            print("Textbooks saved successfully!")
        elif choice == "6":
            break
        else:
            print("Invalid choice!")

if __name__ == "__main__":
    main()

上述代码定义了`Textbook`和`TextbookManager`两个类，`Textbook`类表示教材的属性，`TextbookManager`类封装了增加、删除、查询、修改等功能。在`main`函数中，我们通过循环让用户输入选择来实现不同功能的调用。同时，我们使用文件存储教材信息，可以在程序退出时保存教材信息。