Python - pandas, DataFrame look like Nan but the behavior is like number -

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when or save to_csv dataframe see cell containing nan, when use same cell behaves number. how comes? 

in [84]: db['category_1']['also'] out[84]: 0.91652216992816438  in [85]: db.loc['also'] out[85]:  frequency     0.275729 ts_1              true category_1         nan name: also, dtype: object  in [88]: db['category_1'].sum() out[88]: 99.99999999999974  in [89]: db['category_1']['also'] = 0          db['category_1'].sum() out[89]: 99.08347783007159


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