from datetime import datetime
def date_split(calendar):
  for row in calendar:
    new_calendar={}
    listdate=datetime.strptime(row['date'],'%Y-%M-%D')

----> 7         listdate=datetime.strptime(row['date'],'%Y-%M-%D')
TypeError: string indices must be integers

print (df['date'].dtype)
object

df['date'] = pd.to_datetime(df['date'])

print (df['date'].dtype)
datetime64[ns]

df['year'] = df['date'].dt.year
df['month'] = df['date'].dt.month
df['day'] = df['date'].dt.day

listdate = df['date'].dt.date.tolist()
print (listdate)

[datetime.date(2017, 9, 5),
 datetime.date(2017, 9, 4),
 datetime.date(2017, 9, 3),
 datetime.date(2017, 9, 2),
 datetime.date(2017, 9, 1)]