Weird behavior in custom script

[Mailstorm-ctrl]

I have a script that will poll various support APIs based on manufacturer for warranty information. I have a few variables for the script to help target devices by whatever. Below is the section of my code that compensates for when a script variable isn't filled in:

        if data['region'] is None:
            data['region'] = [x.id for x in Region.objects.all()]
        else:
            data['region'] = list(Region.objects.get(name=data['region']).id)
        
        if data['site'] is None:
            data['site'] = [x.id for x in Site.objects.all()]
        else:
            data['site'] = list(Site.objects.get(name=data['site']).id)
        
        if data['devicerole'] is None:
            data['devicerole'] = [x.id for x in DeviceRole.objects.all()]
        else:
            data['devicerole'] = list(DeviceRole.objects.get(name=data['devicerole']).id)
        
        if data['manufacturer'] is None:
            data['manufacturer'] = [x.id for x in Manufacturer.objects.all()]
        else:
            data['manufacturer'] = list(Manufacturer.objects.get(name=data['manufacturer']).id)
        ## End Default Values

        devices = [device for device in Device.objects.all() if device.site.region.id in data['region'] and device.site.id in data['site'] and device.role.id in data['devicerole'] and device.device_type.manufacturer.id in data['manufacturer']]

This is my 4th iteration trying to get this to work. Currently the error I'm getting in Netbox when running this script with a variable present (in this case the region) is:

An exception occurred: TypeError: 'int' object is not iterable

Traceback (most recent call last):
  File "/opt/netbox-4.0.3/netbox/extras/scripts.py", line 658, in _run_script
    script.output = script.run(data, commit)
  File "/opt/netbox-4.0.3/netbox/scripts/Warranty Lookups.py", line 118, in run
    data['region'] = list(Region.objects.get(name=data['region']).id)
TypeError: 'int' object is not iterable

I'm not sure I understand why. I'm not iterating over an int. I'm tried just doing data['region'] = list(data['region'].id) and data['region'] = list(data['region']) but they all result in similar errors.

And the reason why I have to turn it into a list is because of my nice big list comprehension for devices.

[Mailstorm-ctrl]

As it turns out, this is just python behavior I wasn't aware of.

list(1) --> Exception
[1] --> All Good