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At the end of a form wizard, I have a custom save for an object:

def done(self, form_list, **kwargs): (...) start = datetime.strptime(self.request.session['event_start'], '%Y-%m-%d %H:%M:%S') duration = datetime.strptime(self.request.session['duration'], '%H:%M:%S').time() EventInstance.objects.create( event=event_obj, start=start, duration=duration, recurring='0F', ) (...)

I've manually written a string in for the final step, to try and isolate the problem. When I try to run the final script, the traceback highlights the recurring field with a TypeError and tells me that Python expected string or bytes-like object.

This is my model:

class EventInstance(models.Model): event = models.ForeignKey(Event) start = models.DateTimeField() duration = models.DateTimeField() recurring = models.CharField(max_length=2)

event_obj is an Event object that I created earlier in the process. Can someone help me understand this error?

Traceback here:

Traceback: File "C:\Users\Zeratul\Envs\otherlane\lib\site-packages\django\core\handlers\base.py" in get_response 132. response = wrapped_callback(request, *callback_args, **callback_kwargs) File "C:\Users\Zeratul\Envs\otherlane\lib\site-packages\django\views\generic\base.py" in view 71. return self.dispatch(request, *args, **kwargs) File "C:\Users\Zeratul\Envs\otherlane\lib\site-packages\formtools\wizard\views.py" in dispatch 237. response = super(WizardView, self).dispatch(request, *args, **kwargs) File "C:\Users\Zeratul\Envs\otherlane\lib\site-packages\django\views\generic\base.py" in dispatch 89. return handler(request, *args, **kwargs) File "C:\Users\Zeratul\Documents\otherlane\Otherlane\Events\views.py" in post 181. return self.render_done(form, **kwargs) File "C:\Users\Zeratul\Envs\otherlane\lib\site-packages\formtools\wizard\views.py" in render_done 357. **kwargs) File "C:\Users\Zeratul\Documents\otherlane\Otherlane\Events\views.py" in done 239. recurring='0F', File "C:\Users\Zeratul\Envs\otherlane\lib\site-packages\django\db\models\manager.py" in manager_method 127. return getattr(self.get_queryset(), name)(*args, **kwargs) File "C:\Users\Zeratul\Envs\otherlane\lib\site-packages\django\db\models\query.py" in create 348. obj.save(force_insert=True, using=self.db) File "C:\Users\Zeratul\Envs\otherlane\lib\site-packages\django\db\models\base.py" in save 734. force_update=force_update, update_fields=update_fields) File "C:\Users\Zeratul\Envs\otherlane\lib\site-packages\django\db\models\base.py" in save_base 762. updated = self._save_table(raw, cls, force_insert, force_update, using, update_fields) File "C:\Users\Zeratul\Envs\otherlane\lib\site-packages\django\db\models\base.py" in _save_table 846. result = self._do_insert(cls._base_manager, using, fields, update_pk, raw) File "C:\Users\Zeratul\Envs\otherlane\lib\site-packages\django\db\models\base.py" in _do_insert 885. using=using, raw=raw) File "C:\Users\Zeratul\Envs\otherlane\lib\site-packages\django\db\models\manager.py" in manager_method 127. return getattr(self.get_queryset(), name)(*args, **kwargs) File "C:\Users\Zeratul\Envs\otherlane\lib\site-packages\django\db\models\query.py" in _insert 920. return query.get_compiler(using=using).execute_sql(return_id) File "C:\Users\Zeratul\Envs\otherlane\lib\site-packages\django\db\models\sql\compiler.py" in execute_sql 973. for sql, params in self.as_sql(): File "C:\Users\Zeratul\Envs\otherlane\lib\site-packages\django\db\models\sql\compiler.py" in as_sql 931. for obj in self.query.objs File "C:\Users\Zeratul\Envs\otherlane\lib\site-packages\django\db\models\sql\compiler.py" in <listcomp> 931. for obj in self.query.objs File "C:\Users\Zeratul\Envs\otherlane\lib\site-packages\django\db\models\sql\compiler.py" in <listcomp> 929. ) for f in fields File "C:\Users\Zeratul\Envs\otherlane\lib\site-packages\django\db\models\fields\__init__.py" in get_db_prep_save 710. prepared=False) File "C:\Users\Zeratul\Envs\otherlane\lib\site-packages\django\db\models\fields\__init__.py" in get_db_prep_value 1482. value = self.get_prep_value(value) File "C:\Users\Zeratul\Envs\otherlane\lib\site-packages\django\db\models\fields\__init__.py" in get_prep_value 1461. value = super(DateTimeField, self).get_prep_value(value) File "C:\Users\Zeratul\Envs\otherlane\lib\site-packages\django\db\models\fields\__init__.py" in get_prep_value 1317. return self.to_python(value) File "C:\Users\Zeratul\Envs\otherlane\lib\site-packages\django\db\models\fields\__init__.py" in to_python 1420. parsed = parse_datetime(value) File "C:\Users\Zeratul\Envs\otherlane\lib\site-packages\django\utils\dateparse.py" in parse_datetime 93. match = datetime_re.match(value) Exception Type: TypeError at /events/post_event/ Exception Value: expected string or bytes-like object

EDIT

Looking more closely at the traceback, it seems to be an issue with the "Duration" field. Perhaps because I am trying to save a time as a datetime object?

▼ Local vars Variable Value __class__ <class 'django.db.models.fields.DateField'> value datetime.time(0, 30) self <django.db.models.fields.DateTimeField: duration>
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It's highlighted on the last line, but it's obvious that by tracing the stack it ends up in django's dateparse.py file, which indicates that it's related to datetime issues not correctly parsed. Traceback would only highlight a complete statement but since your create function is a multi-line statement, it marks on the recurring='0F' line. In other words, it tells you that your statement EventInstance.objects.create(......) is problematic.

I believe that your duration field is DateTimeField, but your duration variable is a datetime.time object. You can't feed a time object to datetime field obviously.

The solution is easy, change duration field to TimeField.

Django doc about TimeField.

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2 Comments

That was it! Thank you! The traceback was confusing me, but I understand why now.
Glad that it helped. One advice, I edited your question by moving your traceback in the body of the question instead of a link. Don't rely on other website services because they might go down. Stackoverflow display traceback nicely and let others see it immediately so they could benefit from your question as well.

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