在Python中填充数据帧

我有一个类似的数据集，即使代码给了我正确的输出；我不想使用三个for循环。有没有更好的办法

import pandas as pd

col = ["a","b","c","d"]
index = ["0","1","2","3"]
dict_ = {("0","a"):8,
         ("1","a"):3,
         ("3","b"):2}

df = pd.DataFrame(columns=col,index=index)
for i in range(len(dict_)):
    for j in range(len(df)):
        for k in range(len(df)):
            if (str(df.index[j]),str(df.columns[k])) == dict_.keys()[i]:
                df.at[df.index[j],df.columns[k]] = dict_.values()[i]

print df

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IIUC，使用

reindex

pd.Series(dict_).unstack().reindex(index=index,columns=col)
Out[245]: 
     a    b   c   d
0  8.0  NaN NaN NaN
1  3.0  NaN NaN NaN
2  NaN  NaN NaN NaN
3  NaN  2.0 NaN NaN

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美丽的！谢谢：'）@W-B。。is总是提供漂亮的解决方案和提示：-）+1