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group by dateime pandas Code Example
groupby year datetime pandas
data.groupby(data.date.dt.year)
group by dateime pandas
df['date_minus_time'] = df["_id"].apply( lambda df : 
datetime.datetime(year=df.year, month=df.month, day=df.day))	
df.set_index(df["date_minus_time"],inplace=True)




Python

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