如何從嵌套的字典在python

Question

我從文件中讀取數據這樣的檢索單個項目：

{"day" :"Monday", "alarm":"on", "kids":"School" , "work":"days"} 
{"day" :"Tuesday", "alarm":"on", "kids":"School" , "work":"days"} 
{"day" :"Wednesday", "alarm":"on", "kids":"School" , "work":"days"} 
{"day" :"Thursday", "alarm":"on", "kids":"School" , "work":"nights"} 
{"day" :"Friday", "alarm":"on", "kids":"School" , "work":"nights"} 
{"day" :"Saturday", "alarm":"off", "kids":"Dance" , "work":"overtime"} 
{"day" :"Sunday", "alarm":"off", "kids":"Soccer" , "work":"off"} 

我將數據放入一個字典，然後評估該詞典的一些條件和配售該字典到另一個字典，像這樣：

import ast 
o=open('schedule.txt','rb') 
day_={} 
for lines in o: 
    dict_={} 
    dict_= ast.literal_eval(lines) 
    if dict_['day']=='Monday': 
     day_['1']=dict_.items() 
    elif dict_['day']=='Tuesday': 
     day_['2']=dict_.items() 
    elif dict_['day']=='Wednesday': 
     day_['3']=dict_.items() 
    elif dict_['day']=='Thursday': 
     day_['4']=dict_.items() 
    elif dict_['day']=='Friday': 
     day_['5']=dict_.items() 
    elif dict_['day']=='Saturday': 
     day_['6']=dict_.items() 
    elif dict_['day']=='Sunday': 
     day_['7']=dict_.items() 
    else: 
     print('there was an error') 
o.close() 
print day_.items() 
#this seems to work properly 

現在，如果我只是想找出孩子們正在做的第4天，我該怎麼辦呢？ 或者是否有一種更簡單的方法來保存數據以供將來在程序中參考？

Answer 1

通過使用字典將星期幾名稱映射到數字，可以簡化代碼。爲了提取4天記錄的"kids"項目，你可以使用result[4]["kids"]：

days = {"Monday": 1, "Tuesday": 2, "Wednesday": 3, "Thursday": 4, 
     "Friday": 5, "Saturday": 6, "Sunday": 7} 
result = {} 
with open('schedule.txt', 'rb') as f: 
    for line in f: 
     d = ast.literal_eval(line) 
     result[days[d["day"]]] = d 
print result[4]["kids"]