python-字典输出学习

1、目标
******欢迎使用单词本*****
1、添加单词``
2、查找单词
3、删除单词
4、退出单词
******谢谢使用单词本*****
请选择：

代码为：估计还有bug待以后在次完善
#encoding=utf-8

WordLibrary = {} #存放单词库
words = ''   #查找单词
Explain = ''   #词义
determine = '' #判断是否删除

#1、添加单词
def add_words():
    while True:
        words = str(raw_input("\n请输入要添加的单词，输入“exit”退出\n".decode("utf-8").encode("gbk"))) #Please add the list to the word library, type exit from the word library
        Explain = str(raw_input("\n请输入要添加的词义，输入“exit”退出\n".decode("utf-8").encode("gbk")))
        if words == "exit" or Explain == "exit":
            break
        WordLibrary[str(words)]  = str(Explain)
    print u'单词添加成功，请继续使用！\n'        

#2、查找单词
def find_words():
    words = str(raw_input("请输入要查找的单词:\n".decode("utf-8").encode("gbk"))) #Please enter to find words 
    print u"你输入的单词是：",words
    for key in sorted(WordLibrary.keys()):
        if str(words) == key:
            print u'你查找的单词是：',key,WordLibrary[key]
            break
    else:
        print u'你查找的单词不存在\n'

#3、删除单词
def del_words():
    words = str(raw_input("请输入要删除的单词:\n".decode("utf-8").encode("gbk"))) #Please enter the word to delete
    for key in sorted(WordLibrary.keys()):
        if str(words) == key:
            print  u'你查找的单词是：', key, WordLibrary[key]
            determine = str(raw_input("请确定是否删除，输入 y or n :\n".decode("utf-8").encode("gbk")))
            if determine == 'Y' or determine == 'y':
                del WordLibrary[words]
            else:
                print u'你要删除的单词不存在'
                break       
    print u'操作完毕！\n'

def out_word():
    print u'谢谢使用！！'
    return

def menu_print():
    print u'******欢迎使用单词本*****'
    print u'1、添加单词'
    print u'2、查找单词'
    print u'3、删除单词'``
    print u'4、退出单词'
    print u'******谢谢使用单词本*****'

def print_menu():
    menu_print()
    number = 0
    while True:
        print u'请选择：'
        try:
            number = int(raw_input("\n请选择菜单:\n".decode("utf-8").encode("gbk")))
        except IOError:
            print u'请在输入\n'
        if number == 1 :
            add_words()
            continue
        elif number == 2 :
            find_words()
            continue
        elif number == 3 :
            del_words()
            continue
        elif number == 4 :
            out_word()
            break
        else:
            print u'\n你选择的不存在程序退出服务\n'
            break

print_menu()