python列表使用实现名字管理系统

# 名字管理系统 列表的使用
print("="*50)
print("1:添加名字")
print("2:修改名字")
print("3:查询名字")
print("4:删除名字")
print("5:退出")
print("="*50)
names = [] 
while True:
 num = int(input("请输入要操作的序号：")) # input获取到的是str，要转换为Int
 
 if num == 1:
 name_add = input("请输入要添加的名字：")
 names.append(name_add)
 print(names)
 elif num == 2:
 name_edit1 = input("请输入要修改的原始名字")
 # 法一：
 # if name_edit1 in names:
 # for i in range(len(names)):
 # if name_edit1 == names[i]:
 # name_edit2 = input("请输入要修改为的名字：")
 # names[i] = name_edit2
 # print("修改成功！")
 # else:
 # print("查无此人")
 
 # 法二：
 find_name = 0 # 默认没找到
 for i in range(len(names)):
 if name_edit1 == names[i]:
 name_edit2 = input("请输入要修改为的名字：")
 names[i] = name_edit2
 print("修改成功！")
 find_name = 1
 if find_name = 0:
 print("查无此人")
 elif num == 3:
 name_select = input("请输入要查询的名字：")
 if name_select in names:
 print("找到了要查找的人")
 else:
 print("查无此人")
 elif num == 4:
 name_del = input("请输入要进行删除的名字：")
 if name_del in names:
 names.remove(name_del)
 print("删除成功！")
 else:
 print("查无此人，无法进行删除")
 elif num == 5:
 break
 else:
 print("输入错误！")

#打印提示
print("="*50)
print("names_manage_systme")
print("1、add a new name")
print("2、delete a name")
print("3、modify a name")
print("4、search a name")
print("5、quit!")
print("="*50)

#存储用户姓名
names = []

while True:
#获取用户输入
 user_input_num = int(input("please input the number you need:"))
#功能实现
 if user_input_num == 1: #增加
 new_name = input("please input the new name that you need to add:")
 names.append(new_name)
 print(names)
 elif user_input_num == 2: #删除
 del_name = input("please input the new name that you need to delete:")
 names.remove(del_name)
 print(names)
 elif user_input_num == 3: #改
 modify_name = input("please input the new name that you need to modify:")
 after_modify_name = input("please input the new name :")
 length = len(names)
 modify_name_index = 0
 i = 0
 while i < length:
 if modify_name == names[i]:
 modify_name_index = i
 break
 i += 1
 names[modify_name_index] = after_modify_name
 print(names)

 elif user_input_num == 4: #查找
 search_name = input("please input the new name that you need to search:")
 length = len(names)
 search_name_index = 0
 i = 0
 while i < length:
 if search_name == names[i]:
 search_name_index = i
 break
 i += 1
 if i == length:
 search_name_index = -1 #没有找到的话令索引置为-1
 print("the index of your search_name is:%d"%search_name_index)

 elif user_input_num == 5: #退出
 print("quit success!")
 break
 else:
 print("input number wrong!\nplease input again")