# coding=utf-8

book_list_in_library = []
ready_borrow_book_list = []
borrowed_book_list = []

menu_info = """
input 1:add new book to library
input 2:borrow book from library
input 3:list all books in library
input 4:list all borrowed books in library
input 5: list current books in library
input 6:lend a book
"""

def add_book():
    global book_list_in_library
    global ready_borrow_book_list
    book_name = raw_input("please input the book name to add:")
    book_list_in_library.append(book_name)
    ready_borrow_book_list.append(book_name)

def borrow_book():
    global ready_borrow_book_list
    global borrowed_book_list
    while 1:
        book_name = raw_input("please input the book name to borrow:")
        if book_name in ready_borrow_book_list:
            ready_borrow_book_list.remove(book_name)
            borrowed_book_list.append(book_name)
            print "borrow book done!"
            break
        else:
            print "the book you borrow does not exist,try again!"

def lend_book():
    global ready_borrow_book_list
    global borrowed_book_list
    while 1:
        book_name = raw_input("please input the book name to lend:")
        if book_name in borrowed_book_list:
            borrowed_book_list.remove(book_name)
            ready_borrow_book_list.append(book_name)
            print "lend book done!"
            break
        else:
            print "the book you lend does not exist,try again!"

while 1:
    print menu_info
    command = raw_input("please input your command:")
    if command == "1":
        add_book()
        print ready_borrow_book_list
        print book_list_in_library
        continue
    if command == "2":
        borrow_book()
    if command == "3":
        print "all books are :", book_list_in_library
    if command == "4":
        print "borrowed books are :", borrowed_book_list
    if command == "5":
        print "current books in library are :", ready_borrow_book_list
    if command == "6":
        lend_book()
    if command == "q":
        break

心得：把功能分解，一个方法一个实现

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