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pandasでNaNをNoneに置き換える

pandasのデータフレーム内でNaNになっている値をNoneに替えたほうがコードが書きやすいことがあります。例えば、値をif文で処理するときなどNaNだったら

羽の数 = 生き物['羽の数'] if 生き物['羽の数'] is not np.NaN else 0 

などと書くところ、Noneだったら

羽の数 = 生き物['羽の数'] if 生き物['羽の数'] else 0

で動作します。

データフレーム中のNaNを一度にNoneに置き換えるときは

生き物_df.replace({np.NaN: None}, inplace=True)

これでいけます。

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Help us understand the problem. What are the problem?