Pandas Dataframe 检查列值是否在列列表中

问题描述

我有一个数据框 df:

data = {'id':[12,112],
        'idlist':[[1,5,7,12,112],[5,7,12,111,113]]
       }
df=pd.DataFrame.from_dict(data)

看起来像这样:

    id                idlist
0   12    [1, 5, 7, 12, 112]
1  112  [5, 7, 12, 111, 113]

我需要检查 id 是否在 idlist 中，然后选择或标记它.我尝试了以下变体并收到评论错误:

I need to check and see if id is in the idlist, and select or flag it. I have tried variations of the following and receive the commented error:

df=df.loc[df.id.isin(df.idlist),:] #TypeError: unhashable type: 'list'
df['flag']=df.where(df.idlist.isin(df.idlist),1,0) #TypeError: unhashable type: 'list'

一些可能的解决方案的其他方法是 .apply 在列表理解中?

Some possible other methods to a solution would be .apply in a list comprehension?

我在这里寻找解决方案，要么选择 id 在 idlist 中的行，要么用 1 标记该行，其中 id 在 idlist 中.结果 df 应该是:

I am looking for a solution here that either selects the rows where id is in idlist, or flags the row with a 1 where id is in idlist. The resulting df should be either:

   id              idlist
0  12  [1, 5, 7, 12, 112]

或:

   flag   id                idlist
0     1   12    [1, 5, 7, 12, 112]
1     0  112  [5, 7, 12, 111, 113]

感谢您的帮助！

推荐答案

使用apply:

df['flag'] = df.apply(lambda x: int(x['id'] in x['idlist']), axis=1)
print (df)
    id                idlist  flag
0   12    [1, 5, 7, 12, 112]     1
1  112  [5, 7, 12, 111, 113]     0

类似:

df['flag'] = df.apply(lambda x: x['id'] in x['idlist'], axis=1).astype(int)
print (df)
    id                idlist  flag
0   12    [1, 5, 7, 12, 112]     1
1  112  [5, 7, 12, 111, 113]     0

使用列表推导:

df['flag'] = [int(x[0] in x[1]) for x in df[['id', 'idlist']].values.tolist()]
print (df)
    id                idlist  flag
0   12    [1, 5, 7, 12, 112]     1
1  112  [5, 7, 12, 111, 113]     0

过滤解决方案:

---

Solutions for filtering:

df = df[df.apply(lambda x: x['id'] in x['idlist'], axis=1)]
print (df)
   id              idlist
0  12  [1, 5, 7, 12, 112]

df = df[[x[0] in x[1] for x in df[['id', 'idlist']].values.tolist()]]
print (df)

   id              idlist
0  12  [1, 5, 7, 12, 112]

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