TypeError：描述符“ strftime”需要一个“ datetime.date”对象，但收到一个“ str”

Question

I am trying to get date from pickle file and add one day to the date. The print statement returns 2018-09-10 . Then getting error 'strftime' requires a 'datetime.date' object but received a 'str' on datetime.datetime.strftime(dataHist['last_updated'], '%Y-%m-%d') line

Import pickle

dataHistFile = open('dat.pkl', 'rb')
dataHist = pickle.load(dataHistFile, encoding='bytes')
print(dataHist['last_updated'])
dt_obj = datetime.datetime.strftime(dataHist['last_updated'], '%Y-%m-%d')
date = dt_obj + datetime.timedelta(days=1)

2018-09-10
File "C:/Users/Arvinth Kumar/Downloads/strtsmrt-master/gendata.py", line 81, in init fetchData() File "C:/Users/Arvinth Kumar/Downloads/strtsmrt-master/gendata.py", line 15, in fetchData news.init() File "C:\\Users\\Arvinth Kumar\\Downloads\\strtsmrt-master\\news.py", line 58, in init getNews() File "C:\\Users\\Arvinth Kumar\\Downloads\\strtsmrt-master\\news.py", line 38, in getNews dt_obj = datetime.datetime.strftime(dataHist['last_updated'], '%Y-%m-%d') TypeError: descriptor 'strftime' requires a 'datetime.date' object but received a 'str'

Please help!

Answer 1

There is a demo for you to show the difference between strptime and strftime .

import datetime


def datetime_datetime_strptime():
    _datetime = datetime.datetime.strptime(
        "2018-09-09 18:47:30",
        "%Y-%m-%d %H:%M:%S"
    )
    print(str(_datetime))


def datetime_datetime_strftime():
    now = datetime.datetime.now()
    print(now.strftime("%Y/%m/%d"))   # 2018/09/09
    print(now.__format__("%Y/%m/%d")) # 2018/09/09


if __name__ == '__main__':
    datetime_datetime_strftime()
    datetime_datetime_strptime()

Answer 2

dt_obj = datetime.datetime.strftime(dataHist['last_updated'], '%Y-%m-%d')

This piece of your code above creates a string from datetime, so anyway you would have to add time first, then convert to string.

For reverse you should use strptime() instead of strftime() , this way you'll get datetime from string.