#!/usr/bin/env python#-*- coding:utf-8 -*-

defFind(class_name):

class_list=[]

tag=False

with open(‘data‘, ‘r‘, encoding=‘utf8‘) as f:for line inf:if line.strip() == ‘班級：{0}班‘.format(class_name.strip()):

class_list.append(line)

tag=Truecontinue

if tag and line.find(‘班級：‘) !=0:

class_list.append(line)if line.find(‘班級：‘) ==0:

tag=Falsereturnclass_list;defAdd(dic):#{ ‘班級‘:‘191‘,‘學生‘:[{‘姓名‘:‘張三‘,‘學號‘:‘2018001‘,‘年齡‘:18,‘性別‘:‘男‘},{‘姓名‘:‘李四‘,‘學號‘:‘2018002‘,‘年齡‘:21,‘性別‘:‘男‘},{‘姓名‘:‘小花‘,‘學號‘:‘2018003‘,‘年齡‘:18,‘性別‘:‘女‘},{‘姓名‘:‘小紅‘,‘學號‘:‘2018004‘,‘年齡‘:33,‘性別‘:‘女‘}]}

class_obj =eval(dic)

class_name= class_obj[‘班級‘]

class_list=Find(class_name)if len(class_list) >0:print(‘系統中已經存在班級[%s]。‘ %(class_name))returnwith open(‘data‘, ‘a+‘, encoding=‘utf8‘) as f:

f.write(‘\n班級：%s班‘ %(class_name))for student in class_obj[‘學生‘]:

f.write(‘\n 姓名：{0} 學號：{1} 年齡：{2} 性別：{3}‘.format(student[‘姓名‘], student[‘學號‘], student[‘年齡‘],

student[‘性別‘]))print(‘添加成功！‘)defUpdate(dic):

class_obj=eval(dic)

class_name= class_obj[‘班級‘]

class_list=Find(class_name)if len(class_list) ==0:print(‘沒有查詢到該班級信息。‘)returnDelete(class_name)

Add(dic)print(‘更新成功！‘)defDelete(class_name):

class_list=Find(class_name)if len(class_list) ==0:print(‘沒有查詢到該班級信息。‘)returnclass_list=[]

tag=False

with open(‘data‘, ‘r‘, encoding=‘utf8‘) as old_file:for line inold_file:if line.strip() == ‘班級：{0}班‘.format(class_name.strip()):

tag=Truecontinue

else:if tag and line.find(‘班級：‘) !=0:continue

if line.find(‘班級：‘) ==0:

tag=False

class_list.append(line)

with open(‘data‘, ‘w‘, encoding=‘utf8‘) as new_file:for line inclass_list:

new_file.write(line)print(‘刪除成功！‘)if __name__ == ‘__main__‘:whileTrue:print(‘\n1、查詢 2、修改 3、添加 4、刪除‘)

operation= input(‘請輸入操作：‘)if (operation == ‘1‘):

class_name= input(‘請輸入查詢的班級名稱：‘)

class_list=Find(class_name)if len(class_list) ==0:print(‘沒有查詢到該班級信息。‘)else:for line inclass_list:print(line, end=‘‘)elif (operation == ‘2‘):

dic= input(‘請輸入修改的字典數據：‘)

Update(dic)elif (operation == ‘3‘):

dic= input(‘請輸入添加的字典數據：‘)

Add(dic)elif (operation == ‘4‘):

class_name= input(‘請輸入刪除的班級名稱：‘)

Delete(class_name)else:print("輸入不正確")

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