Python coding error [n chars]?

Question

I have a seemingly stupid and simple mistake, but for life I can’t understand why this is not working. In my test, when I compare two dictionaries, I get this error:

Traceback (most recent call last):
  File "/path/to_my_app/tests/test_unit.py", line 120, in test_destroy_data
    self.assertEqual(obsolete_data, expected_obsolete_data)
AssertionError: {'cou[45 chars]es': {<Category: Test Category>}, 'beers': {<Beer: Test Beer>}} != {'cou[45 chars]es': {<Category: Test Category>}, 'beers': {<Beer: Test Beer>}}
  {'beers': {<Beer: Test Beer>},
   'categories': {<Category: Test Category>},
   'countries': {<Country: Test Country>}}

Django 2.0, Python 3.5

My method:

def destroy_data(self):
    """
    Remove entries not in the csv file.
    """
    obsolete_data = {
        'beers': set(Beer.objects.all()) ^ set(self.beer_list),
        'categories': set(Category.objects.all()) ^ set(self.category_list),
        'countries': set(Country.objects.all()) ^ set(self.country_list),
    }

    for data in obsolete_data:
        [obj.delete() for obj in obsolete_data[data]]

    return obsolete_data

My test:

def test_destroy_data(self):
    """
    Remove old entries.
    """
    self.importer.import_data(destroy=False)
    obsolete_data = self.importer.destroy_data()
    expected_obsolete_data = {
        'countries': {self.country},
        'categories': {self.category},
        'beers': {self.beer},
    }
    self.assertEqual(obsolete_data, expected_obsolete_data)

When I check these two values ​​in my debugger, they are both the same or at least printed in this way. I tried writing keys in unicode, but I get the same error. Why does [45 characters] appear ?

UPDATE

I set maxDiff to None when using self.assertDictEqual and I get all the error output, but the error remains the same:

Traceback (most recent call last):
  File "/path/to_my_app/tests/test_unit.py", line 124, in test_destroy_data
    self.assertDictEqual(obsolete_data, expected_obsolete_data)
AssertionError: {'cat[35 chars]>}, 'beers': {<Beer: Test Beer>}, 'countries':[22 chars]ry>}} != {'cat[35 chars]>}, 'countries': {<Country: Test Country>}, 'b[22 chars]er>}}
  {'beers': {<Beer: Test Beer>},
   'categories': {<Category: Test Category>},
   'countries': {<Country: Test Country>}}

Answer 1

. , . , , , ( .id is None, - 1). :

self.importer.import_data(destroy=False)
obsolete_data = self.importer.destroy_data()
expected_obsolete_data = {
    'countries': [self.country, ],
    'categories': [self.category, ],
    'beers': [self.beer, ],
}

self.assertEqual(
    obsolete_data['countries'][0].name,
    expected_obsolete_data['countries'][0].name
)
self.assertEqual(
    obsolete_data['categories'][0].name,
    expected_obsolete_data['categories'][0].name
)
self.assertEqual(
    obsolete_data['beers'][0].name,
    expected_obsolete_data['beers'][0].name
)