python - Pad dates within groups with pandas -

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i'm trying pad dates within group ('type') , backfill new rows. i've seen examples using reindex, i'm not sure how pad these dates while maintaining groups.

in:

type    date        value       2016-01-01  1       2016-01-04  3 b       2016-01-10  4 b       2016-01-13  7

desired out:

type    date        value       2016-01-01  1       2016-01-02  3       2016-01-03  3       2016-01-04  3 b       2016-01-10  4 b       2016-01-11  7 b       2016-01-12  7 b       2016-01-13  7 

df.set_index('date').groupby('type', as_index=false).resample('d').bfill().reset_index().drop('level_0', axis=1) out:          date type  value 0 2016-01-01         1 1 2016-01-02         3 2 2016-01-03         3 3 2016-01-04         3 4 2016-01-10    b      4 5 2016-01-11    b      7 6 2016-01-12    b      7 7 2016-01-13    b      7

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