pandas.dt.(dayofweek,year,month,day,weekday,weekday_name)

#data_time을 이용해 요일 알아내기
data2.일자.dt.dayofweek

data2['년']=data2.일자.dt.year
data2['월']=data2.일자.dt.month
data2['일']=data2.일자.dt.day
data2['wday']=data2.일자.dt.weekday
data2['wname']=data2.일자.dt.weekday_name

# 0 : 월요일

data2.head()

data2['요일']=data2.일자.dt.weekday.map({0:'월',1:'화',2:'수',3:'목',4:'금',5:'토',6:'일'})
data2.head()