book_name=raw_input(u"请输入要添加的书名：".encode("gbk"))
book_list.append(book_name)
unborrowed_book.append(book_name)
printu"添加书成功"
defborrow_book():#借书
globalborrowed_book
while1:
book_name=raw_input(u"请输入要借的书名：".encode("gbk"))
ifbook_nameinunborrowed_book:
unborrowed_book.remove(book_name)
borrowed_book.append(book_name)
printu"借书成功"
break
else:
printu"抱歉，您要借的书不存在!"
continue_back=raw_input(u"继续借书请输入：c返回主菜单请输入：b：".encode("gbk"))
ifcontinue_back.lower()=="c":
continue
elifcontinue_back.lower()=="b":
printu"输入数据无效"
defreturn_book():#还书
book_name=raw_input(u"请输入要还的书名：".encode("gbk"))
ifbook_nameinborrowed_book:
borrowed_book.remove(book_name)
printu"还书成功"
printu"您输入的书名不是此图书馆的"
continue_back=raw_input(u"继续还书请输入：c返回主菜单请输入：b：".encode("gbk"))
menu_info='''
添加书--请输入：1
借书--请输入：2
查看可借阅的书--请输入：3
查看借出去的书--请输入：4
还书--请输入：5
查看所有书--请输入：6
退出--请输入：q
'''
importsys
printmenu_info.decode("utf-8")
whileTrue:
command=raw_input(u"请输入您要做的操作选项：".encode("gbk"))