python - Hi, I am trying to add weekstart column -

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in current table having date column , column able find out weekday.by using to_timedelta have created week_start column not giving correct date. here code is:

final_data['weekday'] = final_data['dateofinvoice'].dt.weekday  final_data['weekstart'] = final_data['dateofinvoice'] - pd.to_timedelta(final_data['weekday'],unit='ns', box=true, coerce=true)

output as:

 date       weekday   weekstart 2016-07-23  5         2016-07-22

iiuc can construct timedeltaindex , subtract other column:

in [152]: df['weekstart'] = df['date'] - pd.timedeltaindex(df['weekday'], unit='d') df  out[152]:         date  weekday  weekstart 0 2016-07-23        5 2016-07-18

in fact weekday column unnecessary:

in [153]: df['weekstart'] = df['date'] - pd.timedeltaindex(df['date'].dt.dayofweek, unit='d') df  out[153]:         date  weekday  weekstart 0 2016-07-23        5 2016-07-18

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