#获取图书

#从文件中读取图书，并写入列表

def getBook():

    bookList =[]

    f = open("book.txt","r")

    tempList = f.readlines()    

    for temp in tempList:

        temp = temp[:-1]

        bookList.append(temp)

    f.close()

    return bookList



#保存图书    

#将添加的图书从列表写入文件

def saveBook(bookList):

    f = open("book.txt","w")

    for temp in bookList:

        f.write(temp+"\n")

    f.close()

    

#添加图书

#将图书添加至列表    

def addBook(book):

    global books

    books.append(book)

    

#删除图书

#将图书从列表中删除    

def removeBook(book):

    global books

    if book in books:

        books.remove(book)

    else:

        print("没有找到",book,"这本书。")

        

        

        

#菜单        

print("""

1.添加图书

2.删除图书

3.展示所有图书

4.保存并退出

""")



book = getBook()



while True:

    x = input("请输入功能键(1-4):")

    if x == "1":

        name = input("请输入要添加的图书名称: ")

        addBook(name)

    elif x == "2":

        tempBook = input("请输入要删除的图书名称: ")

        removeBook(tempBook)

    elif x == "3":

        print(books)

    elif x == "4":

        saveBook(books)

        break

    else:

        print("输入有误，请重新输入!")