How to write data to DurationField in Django 2.2?

Question

Django

Good afternoon
There is a model

class Calls(models.Model):
    time = models.DurationField(null=True, blank=True, verbose_name='Продолжительность')

There is an .xls file from which we take a Cell with a value:
00:20:15
Next, create a new record:

duration = row[2] #Строка из файла
Calls.objects.create( time = duration)

I am getting an error:

'str' object has no attribute 'days'
Exception Location: ...\django\utils\duration.py in duration_microseconds, line 44

I tried to convert the string to:

'datetime.datetime' object
'float' object

But still they do n't have the ' days ' attribute

Answer 1

I decided

import datetime as datetime_class # забыл добавить в ответ

duration = datetime.strptime(duration, "%H:%M:%S")
x_duration =datetime_class.timedelta(hours=duration.hour, minutes=duration.minute, seconds=duration.second).total_seconds()	
duration = timedelta(seconds = x_duration)

Answer 2

he needs timedelta, not a string, not a date, not a number, but timedelta