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Python pandas覚書

Last updated at Posted at 2017-09-21

#Series型からDataframeへの変換
Dataframeを1行ずつ取り出してSeries型に変換し、インデックスを0,1,2,3と降り直す。
(次の例では1行のみなのでインデックスを0としたい)

for key,row in dataframe1.iterrows():        
    dataframe2 = row.to_frame().T.reset_index()

#Dataframeの転置

dataframe1.T

#Azure Machine Leanirngネタ

dict から dataframe に変換する時

pd.DataFrame.from_dict(dic)

したら、以下のエラーが出てしまった。
ValueError: If using all scalar values, you must pass an index

コンストラクタを使うように変更してもだめ。

#こちらはエラーになる
pd.DataFrame(dic)

DataFrameのオプションにindexを追加したら動作するようになった

#これで動くようになる。
pd.DataFrame(dic,index=['i',])
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