Python 模块的参数可以用字典么？哪位大神看看我的代码哪里有问题，报错信息也在的

需要实现的功能是：
三级菜单
1.从文本内读出选项
2.查询每一级的选项，并能对选项进行增/删/改功能
3.每一级可以退出程序或者返回上一层

思路

三个操作模块，分别是 增/删/改 功能
三个查询模块，分别对每一级别进行查询

报错信息：
Traceback (most recent call last):
  File "E:/python/day8/three menu.py", line 79, in <module>
    shen()
  File "E:/python/day8/three menu.py", line 37, in shen
    elif city == 'a':FileAppend(menu)
  File "E:/python/day8/three menu.py", line 17, in FileAppend
    ExChange()
  File "E:/python/day8/three menu.py", line 47, in ExChange
    FileWrite.write(menu)
TypeError: expected a string or other character buffer object

 1 # -*- coding: UTF-8 -*-
 2 #__filename:three menu
 3 #__time:2018/5/13 22:04
 4 
 5 import io
 6 import os
 7 
 8 FileRead = io.open('city','r',encoding='utf8')
 9 FileWrite= open('city_backup','w+')
10 menu = eval(FileRead.read())
11 
12 def FileAppend(MenuAppend):
13 
14     CityAppend = raw_input("请输入添加的城市",)
15     MenuAppend['CityAppend']={}
16     ExChange()
17 
18 def FileDel(MenuDel):
19     CityDel = raw_input("请输入你要删除的城市",)
20     MenuDel.pop('CityDel')
21     ExChange()
22 
23 def FileChance(MenuChance):
24     CityChance = raw_input("请输入被替换的城市",)
25     if CityChance in MenuChance : CityChanced = raw_input("请输入替换的城市",)
26     MenuChance['CityChanced'] = MenuChance['CityChance']
27     MenuChance.pop('CityChance')
28     ExChange()
29 
30 def shen():
31     for i in menu:print (i)
32     city = raw_input('请输入你选择的省份',)
33     if city == 'q': exit()
34     elif city == 'd':FileDel(menu)
35     elif city == 'c':FileChance(menu)
36     elif city == 'a':FileAppend(menu)
37     elif (city in menu) and (menu[city]!=0): shi(city)
38     elif menu[city]==0 :
39         print "该省下面没有市，请添加"
40         FileAppend(menu[city])
41     else:
42         print '请输入正确的省份'
43         shen()
44 
45 def ExChange():
46     FileWrite.write(menu)
47     FileRead.close()
48     FileWrite.close()
49     os.remove('FileRead')
50     os.renames('FileWrite','FileRead')
51 
52 def shi(city):
53     for i in menu[city]: print (i)
54     city1 = raw_input('请输入你选择的市或退出程序(Q)或返回上一级菜单(B)').strip()
55     if city1 == 'b':shen()
56     elif city1 == 'q':exit()
57     elif city1 == 'd':FileDel(menu[city])
58     elif city1 == 'c':FileChance(menu[city])
59     elif city1 == 'a':FileAppend(menu[city])
60     elif (city1 in menu[city])and (menu[city][city1]!=0):xian(city,city1)
61     elif menu[city][city1]==0 : FileAppend( menu[city][city1])
62     else:
63         '请输入正确的市'
64         shi(city)
65 
66 def xian(city,city1):
67     for i in menu[city][city1]: print (i)
68     city2 = raw_input('请选择退出(Q)或返回(B) ')
69     if city2 == 'b': shi(city)
70     elif city2 == 'q': exit()
71     elif city2 == 'd':FileDel(menu[city][city1])
72     elif city2 == 'c':FileChance(menu[city][city1])
73     elif city2 == 'a':FileAppend(menu[city][city1])
74     else:
75         '请输入正确的区或县'
76         xian(city, city1)
77 
78 shen()