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csvに含まれるnanを無視する

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背景

50音のローマ字をcsvでデータにまとめ、pandasで読み取るとき、
や行やワ行に含まれる空白が「NAN」という文字として扱われてしまう
空白は空白として扱いたい。

解決方法

df = df.fillna('')
を使って、読み取ったデータフレームのスペースを''に変換すればOK

nanの削除などは複数記事があったが置き換える記事がなかったのでメモ

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