Re: Popping key causes dict derived from object to revert to object

Loris Bennett wrote at 2024-3-21 10:56 +0100:

...
So as I understand it, I need to convert the InstanceState-objects to,
say, dicts, in order to print them.  However I also want to remove one
of the keys from the output and assumed I could just pop it off each
event dict, thus:
>
   event_dicts = [vars(e) for e in events]
   print(type(event_dicts[0]))
   event_dicts = [e.pop('_sa_instance_state', None) for e in event_dicts]
   print(type(event_dicts[0]))
>
However, this prints
>
 <class 'dict'>

`vars` typically returns a `dict`.

 <class 'sqlalchemy.orm.state.InstanceState'>

This is what you have popped.

>
If I comment out the third line, which pops the unwanted key, I get

Then you do not change `event_dicts`.

You problem likely is:
`pop` does not return the `dict` after the removal of a key
but the removed value.