转换键：字符串列表键：字典中整数列表

Question

我有一个关键字：列表对的字典。列表是字符串列表，但它们需要是整数。下面是什么我开始用一个例子：

dictionary = { 
    "P4021a": ["1","2","3","4","5"], 
    "P4019a": ["1","2","3","4","5"], 
    "P4013a": ["1","2","3","4","5"] 
} 

我试图实现以下目标：

dictionary = { 
    "P4021a": [1,2,3,4,5], 
    "P4019a": [1,2,3,4,5], 
    "P4013a": [1,2,3,4,5] 
} 

这里是我到目前为止已经试过：

new_dict = {} 
for key in dictionary.keys(): 
    new_dict[key] = dictionary[int(key)] 

我收到一个错误，指出int（）无法在列表上操作。所以我也试着在每个列表中添加迭代。

new_dict = {} 
for key in dictionary.keys(): 
    new_dict[key] = dictionary[[int(value) for value in dictionary.values() for i in range(5)]] 

我也试过：

new_dict = {} 
for key in dictionary.keys(): 
    new_dict[key] = dictionary[map(int,key)] 

任何帮助表示赞赏。

Answer 1

for key in dictionary: 
    dictionary[key] = [int(val) for val in dictionary[key]] 

Answer 2

for i in dictionary: 
    dictionary[i]=map(int,dictionary[i]) 
print dictionary 

你可以简单地map到int。

在Python 3由Bhargav指出，map返回map object而不是list因此你需要使用

list(map(int,dictionary[i]))