将新字典作为键的值添加到现有字典中

Question

我有本字典：

my_dict = {
    "apples":"21",
    "vegetables":"30",
    "sesame":"45",
    "papaya":"18",
}

我想生成一个新的，如下所示：

my_dict = {
    "apples" : {"apples":"21"},
    "vegetables" : {"vegetables":"30"},
    "sesame" : {"sesame":"45"},
    "papaya" : {"papaya":"18"},
}

我写了一段这样的代码...

my_dict = {
    "apples":"21",
    "vegetables":"30",
    "sesame":"45",
    "papaya":"18",
}

new_dict={}
new_value_for_dict={}

for key in my_dict:
    new_value_for_dict[key]= my_dict[key]
    new_dict[key]= new_value_for_dict
    # need to clear the last key,value of the "new_value_for_dict"

print(new_dict)

输出结果如下：

{'vegitables':{'vegitables': '30', 'saseme': '45', 
               'apples': '21','papaya': '18'},
 'saseme':{'vegitables': '30', 'saseme': '45', 
           'apples': '21', 'papaya': '18'}, 
 'apples': {'vegitables': '30', 'saseme': '45', 
            'apples': '21', 'papaya': '18'}, 
 'papaya': {'vegitables': '30', 'saseme': '45', 
            'apples': '21', 'papaya': '18'}
}

但这并不是我所期望的。如何消除重复？我怎么纠正它呢？

Answer 1

你可以简单地创建一个带有理解的新字典：

>>> {k:{k:v} for k,v in my_dict.items()}
{'sesame': {'sesame': '45'}, 'vegetables': {'vegetables': '30'}, 'papaya': {'papaya': '18'}, 'apples': {'apples': '21'}}

不过，我看不出有任何理由这样做。您不会获得更多信息，但迭代dict值或检索信息会变得更加困难。

正如@AshwiniChaudhary在评论中提到的那样，你可以简单地将new_value_for_dict={}移动到循环中，以便在每次迭代时重新创建一个新的内部字典：

my_dict = {
    "apples":"21",
    "vegetables":"30",
    "sesame":"45",
    "papaya":"18",
}

new_dict={}

for key in my_dict:
    new_value_for_dict={}
    new_value_for_dict[key]= my_dict[key]
    new_dict[key]= new_value_for_dict

print(new_dict)

Answer 2

就快到了

for key in my_dict:
...     my_dict[key]={key:my_dict.get(key)}