Question

I’m running a small app on Google App Engine with Python.
In the model I have a property of type DateTimeProperty, which is datetime.datetime. When it’s created there is no value (i.e. “None”).
I want compare if that datetime.datetime is None, but I can’t.

if object.updated_date is None or object.updated_date >= past:
  object.updated_date = now

Both updated_date and past is datetime.datetime.

I get the following error.

TypeError: can’t compare datetime.datetime to NoneType

What is the correct way to do this?

Answer 1

You want and, not or.

You may also want to use is None.

EDIT:

Since you’ve determined that object.updated_date isn’t None, this only other possibility is that past is None.