python - isnull: Dataframe altered when saving and reloading as csv? (v17.1) -


i'm working large dataframe , appears after saving csv altered. when reload csv it's fine, if don't, behaviour different. visible when doing 

empty_rows = df['columnname'].isnull()

to clarify: saving dataframe csv , reloading (via df.to_csv , pd.read_csv) appears altering (fixing) dataframe. how possible?


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