PYTHON dict list问题 英文问题 column-based

Question

图片里的问题哦 图片里也给了提示 就是写一个function出来的结果是从dict[str, list[str]]的table里选特定的list，形成一个新的dict[str, list[str]] 一个column-based的.
目的是：Many data tables will contain many columns that are not related to the analysis you are trying to perform. Selecting only the columns you care about makes it easier to focus your attention on the problem at hand.

Answer 1

代码可这样写：

def select(d:dict,l:list)->dict:
    dic={}
    for k in l:
        dic[k]=d[k]
    return dic

dd={'id':[1,2,3,4],'rank':['high','medium','lower','high'],'value':[500,300,100,400],'group':['a','b','b','a']}
lst=['id','value']
print(select(dd,lst))

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