pivot table pandas return dataframe code example
Example: pivot table but keep nan
(df.groupby(['Date', 'A']).B
.apply(lambda x: np.nan if x.isna().all() else x.sum())
.unstack('A')
)
(df.groupby(['Date', 'A']).B
.apply(lambda x: np.nan if x.isna().all() else x.sum())
.unstack('A')
)