[英]Combine two pandas dataframes of dictionaries
I'd like to take 2 separate dataframes, each comprised of a bunch of dictionaries, and combine them to yield the following: 我想采用2个单独的数据帧,每个数据帧由一堆字典组成,并将它们组合以产生以下内容:
df1 = pd.DataFrame([[{'a':1}, {'a':2}]])
df2 = pd.DataFrame([[{'b':1}, {'b':2}]])
df3 = pd.some_function(df1, df2)
where pd.some_function
takes the two dfs and performs a cell-wise merge of the dictionaries: 其中
pd.some_function
接受两个pd.some_function
并执行字典的单元式合并:
0 1
0 {u'a': 1, u'b': 1} {u'a': 2, u'b': 2}
I know I can do this with a for loop, but is there a pandas function that can do this more succinctly? 我知道我可以使用for循环来做到这一点,但是有一个熊猫函数可以更简洁地做到这一点吗? Simply adding the dfs does not work.
仅仅添加dfs是行不通的。 I'm familiar with
df.applymap
, but my understanding is that will apply a function to each cell of a single df. 我熟悉
df.applymap
,但是我的理解是,它将对单个df的每个单元格应用一个函数。
By using concat
+ ChainMap
通过使用
concat
+ ChainMap
from collections import ChainMap
df=pd.concat([df1,df2])
df.groupby(df.index)[0,1].agg(lambda x :dict(ChainMap(*x.values.tolist())))
Out[94]:
0 1
0 {'b': 1, 'a': 1} {'b': 2, 'a': 2}
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