如何在Python数据框中切片列表值？

Question

我对python中的数据框有疑问。

first, this is data frame
index       id                           keyword
0         @aaa_24 @bbb_2     ["@max", "@travel", ... ,"@food"]
1         @aa_1  @c_5        ["@animal", "@weather", ... ,"@coco"]
2         @ab_7  @ba_3                     ...
3         @ccc_1                           ...
...       ...                              ...

and i want to convert like this
index      id           keyword
0       @aaa @bbb     unique.keyword()  --> (count value)    
1       @aa  @c       unique.keyword()  --> (count value) 
2       @ab  @ba      unique.keyword()  --> (count value)
3       @ccc          unique.keyword()  --> (count value)
...        ...

请检查此问题

Answer 1

我不确定这里的目标到底是什么。据我了解，您希望在“关键字”列中获得关键字的频率：

def f(x):
    dic = {}
    ans = []
    for val in x:
        if val not in dic:
            dic[val]=0
        dic[val]+=1
    for key in dic.keys():
        ans.append((key,dic[key]))
    return ans
df['new_keyword'] = df['keywords'].apply(f)

让我知道我是否误解了您的问题