合并包含数据框的字典

Question

我正在合并多个包含数据框作为值的字典。我将此作为参考（How to merge multiple dicts with same key or different key?）。但是合并字典中的值作为列表出现，我需要它是一个数据框。

df1 = pd.DataFrame([1,2,3])
df2 = pd.DataFrame([4,5,6])
df3 = pd.DataFrame([7,8,9])
d1 = {'a' : df1 , 'b' : df2}
d2 = {'c' : df3 , 'a' : df2}

dd = defaultdict(list)
for d in (d1, d2): # you can list as many input dicts as you want here
    for key, value in d.items():
        dd[key].append(value)

预期输出：

{'a' : df1 + df2 ,'b' : df2 , 'c': df3}

键不需要出现在所有字典中。使用 Python 3.

Answer 1

我认为这段代码正是您要找的：

df1 = pd.DataFrame([1,2,3])
df2 = pd.DataFrame([4,5,6])
df3 = pd.DataFrame([7,8,9])
d1 = {'a' : df1 , 'b' : df2}
d2 = {'c' : df3 , 'a' : df2}

dd = {}
for d in (d1, d2): # you can list as many input dicts as you want here
    for key, value in d.items():
        if key in dd.keys():
            dd[key] += value 
        else:
            dd[key] = value

合并包含数据框的字典

Merge dictionary containing dataframes

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