# 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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