Python 即使更改了字典外的同一变量，字典内的变量值也保持不变。为什么？

我有一本字典

餐厅

，希望根据用户输入的日期，在

餐厅

的嵌套列表中更改

营业时间

和

营业时间

的值

opening_time=0
closing_time=0

##snippet of the dictionary 
restaurants={"Macdonald's":\
             \
             [{"Monday":[700,2400],\
               "Tuesday":[700,2400],\
               "Wednesday":[700,2400],\
               "Thursday":[700,2400],\
               "Friday":[700,2400],\
               "Saturday":[700,2400],\
               "Sunday":[1000,2200]},\
              \
              "Block XXX, #01-XX",\
              "Fast food restaurant known for its all round excellent menu.",\
              \
              ["Breakfast",[opening_time,1100],\
               {"Egg McMuffin":"$1",\
                "Hotcakes":"$1",\
                "Big Breakfast":"$1"}],\
              ["Lunch/Dinner",[1100,closing_time],\
               {"Double Cheeseburger":"$3.20",\
                "McChicken":"$3.95",\
                "Big Mac":"$4.70",\
                "Chicken McNuggets (6pcs)":"$4.95",\
                "McWings":"$4.95"}],\
              ["All Day",[opening_time,closing_time],\
               {"Fillet-O-Fish":"$4.60",\
                "Corn Cup":"$1.95"}]]}

我希望代码循环并打印所有餐厅和菜单，同时指示用户输入的时间内是否可以使用所述餐厅和菜单

for key in restaurants:  #key refers to restaurant name
    print("","",sep='\n')
    if day_now in restaurants.get(key)[0].keys():  #check if restaurant is open on that day
        opening_time=restaurants.get(key)[0][day_now][0]  #set opening and closing hours to those on that day
        closing_time=restaurants.get(key)[0][day_now][1]
        if time_now>=opening_time and time_now<closing_time:  #check if restaurant is open within that time period
            status="Open"
            open_restaurants.update(restaurants)
            print(key,"Status: "+status,"Opening Hours Today:"+str(opening_time)+" to "+str(closing_time),\
                  "Location: "+restaurants.get(key)[1],"Description: "+restaurants.get(key)[2],sep='\n')
            for i in range(3, len(restaurants.get(key))):  #goes through the menus the restaurant has
                print(restaurants.get(key)[i][1][0]) #prints 0
                print(restaurants.get(key)[i][1][1]) #prints 0
                if time_now>=restaurants.get(key)[i][1][0] and time_now<restaurants.get(key)[i][1][1]:  #check if menu have
                    print("")
                    print(restaurants.get(key)[i][0]+" Menu: Available","Item: Cost:",sep='\n')
                    for item in restaurants.get(key)[i][2].keys():
                        print(item, restaurants.get(key)[i][2][item],sep=' ')
                else:
                    print("")
                    print(restaurants.get(key)[i][0]+" Menu: Unavailable","Item: Cost:", sep='\n')
                    for item in restaurants.get(key)[i][2].keys():
                        print(item, restaurants.get(key)[i][2][item],sep=' ')            
        else:
            closed_restaurants.update(restaurants)
            status="Closed"
            print(key,"Status: "+status,"Opening Hours Today:"+str(opening_time)+" to "+str(closing_time),\
                  "Location: "+restaurants.get(key)[1],"Description: "+restaurants.get(key)[2], sep='\n')
    else:
        closed_restaurants.update(restaurants)
        status="Closed"
        print(key,"Status: "+status,"Opening Hours Today:"+str(opening_time)+" to "+str(closing_time),\
                  "Location: "+restaurants.get(key)[1],"Description: "+restaurants.get(key)[2], sep='\n')

print(opening_time) #prints the correct opening and closing hours
print(closing_time) 

餐厅钥匙：#钥匙指餐厅名称
打印（“，”，sep='\n'）
如果您现在在餐厅。get（key）[0]。key（）：#检查餐厅当天是否营业
营业时间=餐厅。获取（键）[0][day_now][0]#将营业和关门时间设置为当天的营业和关门时间
关门时间=餐厅。获取（键）[0][day\u now][1]
如果time\u now>=开业时间和time\u now=餐厅。get（key）[i][1][0]和time\u now让我们用这个简单的例子来说明你的假设哪里是错误的：

var = 1
lst = [var]
var = 2
print(lst)

该打印什么，
[1]
或
[2]
？它将打印
[1]
。这里的不是变量引用列表，而是整数列表。您获取值
var
had，并将其放入列表中。一份，如果你想的话

这个怎么样

a = 1
b = a
a = 2

在此之后，
b
仍然是
1
。您将在存储
a
的位置写入的内容取出，并将其放入存储
b
的位置

您需要实际更新字典中的值，仅更新
开放时间是不够的
我不确定您希望在这里输出什么。您认为代码的哪一部分应该改变您在print语句中获得的输出，您希望它打印什么？