做一个小图书馆程序

图书馆的书放到一个list里面保存

使用add命令加一本书

使用leda命令减去一本存在的书

如果不存在提示一下

getall:可以查询没有借出去的书

输入.退出程序

#encoding=utf-8

prompt="""

add bookname:to add a book to the library

lend:to lend a book from the library

getall:to list all book  from the library

.:to exit the program

"""

print(prompt)

library[]

while 1:

    command=input("please input your command")

    command=command.strip()

    if    "add"  in command:

        library.append(command.split("")[1])

    elif "lend"  in command:

        if command.split("")[1] in library:

            library.remove(command.split("")[1])

print("lend book complete!" )

        else:

            print("the book you lend doesn't exist!")

            continue

     elif "getall" in command:

         if len(library)>=1:

             for book in library:

             print(book)

         else:

print("no book in the library!")

     elif"."==command:

         break