pandas.DataFrame.asfreq  
DataFrame.asfreq(freq, method=None, how=None, normalize=False) [source]
 
Convert TimeSeries to specified frequency. Optionally provide filling method to pad/backfill missing values.    
Parameters:

freq : DateOffset object, or string method : {‘backfill’/’bfill’, ‘pad’/’ffill’}, default None Method to use for filling holes in reindexed Series (note this does not fill NaNs that already were present):  ‘pad’ / ‘ffill’: propagate last valid observation forward to next valid ‘backfill’ / ‘bfill’: use NEXT valid observation to fill  how : {‘start’, ‘end’}, default end For PeriodIndex only, see PeriodIndex.asfreq normalize : bool, default False Whether to reset output index to midnight   
Returns:

converted : type of caller    Notes To learn more about the frequency strings, please see this link. 


    
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