Level 2 Test Failures

python3 -m unittest discover -s /usercode/FILESYSTEM/tests -p '*.py' 2>&1 ..........FFFFFFFFFF. ====================================================================== FAIL: test_level_2_case_01_simple_increment_and_stats (level_2_tests.Level2Tests.test_level_2_case_01_simple_increment_and_stats) ---------------------------------------------------------------------- Traceback (most recent call last): File "/opt/python/3.13.12/lib/python3.13/site-packages/timeout_decorator/timeout_decorator.py", line 82, in new_function return function(*args, **kwargs) File "/usercode/FILESYSTEM/tests/level_2_tests.py", line 31, in test_level_2_case_01_simple_increment_and_stats self.assertEqual(self.db.top_n_parcels(2), expected) ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Exception: Lists differ: [] != ['employee(2)'] Second list contains 1 additional elements. First extra element 0: 'employee(2)' - [] + ['employee(2)'] ====================================================================== FAIL: test_level_2_case_02_simple_operations_and_stats (level_2_tests.Level2Tests.test_level_2_case_02_simple_operations_and_stats) ---------------------------------------------------------------------- Traceback (most recent call last): File "/opt/python/3.13.12/lib/python3.13/site-packages/timeout_decorator/timeout_decorator.py", line 82, in new_function return function(*args, **kwargs) File "/usercode/FILESYSTEM/tests/level_2_tests.py", line 39, in test_level_2_case_02_simple_operations_and_stats self.assertEqual(self.db.top_n_parcels(1), expected) ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Exception: Lists differ: [] != ['dept4(2)'] Second list contains 1 additional elements. First extra element 0: 'dept4(2)' - [] + ['dept4(2)'] ====================================================================== FAIL: test_level_2_case_03_key_deleted_and_recreated_and_stats (level_2_tests.Level2Tests.test_level_2_case_03_key_deleted_and_recreated_and_stats) ---------------------------------------------------------------------- Traceback (most recent call last): File "/opt/python/3.13.12/lib/python3.13/site-packages/timeout_decorator/timeout_decorator.py", line 82, in new_function return function(*args, **kwargs) File "/usercode/FILESYSTEM/tests/level_2_tests.py", line 61, in test_level_2_case_03_key_deleted_and_recreated_and_stats self.assertEqual(self.db.top_n_parcels(2), expected) ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Exception: Lists differ: [] != ['aaa(3)', 'a(2)'] Second list contains 2 additional elements. First extra element 0: 'aaa(3)' - [] + ['aaa(3)', 'a(2)'] ====================================================================== FAIL: test_level_2_case_04_multiple_fields_within_key_and_stats (level_2_tests.Level2Tests.test_level_2_case_04_multiple_fields_within_key_and_stats) ---------------------------------------------------------------------- Traceback (most recent call last): File "/opt/python/3.13.12/lib/python3.13/site-packages/timeout_decorator/timeout_decorator.py", line 82, in new_function return function(*args, **kwargs) File "/usercode/FILESYSTEM/tests/level_2_tests.py", line 88, in test_level_2_case_04_multiple_fields_within_key_and_stats self.assertEqual(self.db.top_n_parcels(1), expected) ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Exception: Lists differ: [] != ['John(2)'] Second list contains 1 additional elements. First extra element 0: 'John(2)' - [] + ['John(2)'] ====================================================================== FAIL: test_level_2_case_05_simple_operations_and_stats_tie (level_2_tests.Level2Tests.test_level_2_case_05_simple_operations_and_stats_tie) ---------------------------------------------------------------------- Traceback (most recent call last): File "/opt/python/3.13.12/lib/python3.13/site-packages/timeout_decorator/timeout_decorator.py", line 82, in new_function return function(*args, **kwargs) File "/usercode/FILESYSTEM/tests/level_2_tests.py", line 109, in test_level_2_case_05_simple_operations_and_stats_tie self.assertEqual(self.db.top_n_parcels(1), expected) ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Exception: Lists differ: [] != ['orange(1)'] Second list contains 1 additional elements. First extra element 0: 'orange(1)' - [] + ['orange(1)'] ====================================================================== FAIL: test_level_2_case_06_n_exceeds_amount_of_keys (level_2_tests.Level2Tests.test_level_2_case_06_n_exceeds_amount_of_keys) ---------------------------------------------------------------------- Traceback (most recent call last): File "/opt/python/3.13.12/lib/python3.13/site-packages/timeout_decorator/timeout_decorator.py", line 82, in new_function return function(*args, **kwargs) File "/usercode/FILESYSTEM/tests/level_2_tests.py", line 132, in test_level_2_case_06_n_exceeds_amount_of_keys self.assertEqual(self.db.top_n_parcels(2), expected) ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Exception: Lists differ: [] != ['foo(3)', 'boo(2)'] Second list contains 2 additional elements. First extra element 0: 'foo(3)' - [] + ['foo(3)', 'boo(2)'] ====================================================================== FAIL: test_level_2_case_07_empty_database (level_2_tests.Level2Tests.test_level_2_case_07_empty_database) ---------------------------------------------------------------------- Traceback (most recent call last): File "/opt/python/3.13.12/lib/python3.13/site-packages/timeout_decorator/timeout_decorator.py", line 82, in new_function return function(*args, **kwargs) File "/usercode/FILESYSTEM/tests/level_2_tests.py", line 160, in test_level_2_case_07_empty_database self.assertEqual(self.db.top_n_parcels(1), expected) ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Exception: Lists differ: [] != ['key1(1)'] Second list contains 1 additional elements. First extra element 0: 'key1(1)' - [] + ['key1(1)'] ====================================================================== FAIL: test_level_2_case_08_multiple_operations_and_edge_cases_combined (level_2_tests.Level2Tests.test_level_2_case_08_multiple_operations_and_edge_cases_combined) ---------------------------------------------------------------------- Traceback (most recent call last): File "/opt/python/3.13.12/lib/python3.13/site-packages/timeout_decorator/timeout_decorator.py", line 82, in new_function return function(*args, **kwargs) File "/usercode/FILESYSTEM/tests/level_2_tests.py", line 175, in test_level_2_case_08_multiple_operations_and_edge_cases_combined self.assertEqual(self.db.top_n_parcels(5), expected) ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Exception: Lists differ: [] != ['foo(1)', 'key(1)'] Second list contains 2 additional elements. First extra element 0: 'foo(1)' - [] + ['foo(1)', 'key(1)'] ====================================================================== FAIL: test_level_2_case_09_mixed_multiple_operations_1 (level_2_tests.Level2Tests.test_level_2_case_09_mixed_multiple_operations_1) ---------------------------------------------------------------------- Traceback (most recent call last): File "/opt/python/3.13.12/lib/python3.13/site-packages/timeout_decorator/timeout_decorator.py", line 82, in new_function return function(*args, **kwargs) File "/usercode/FILESYSTEM/tests/level_2_tests.py", line 204, in test_level_2_case_09_mixed_multiple_operations_1 self.assertEqual(self.db.top_n_parcels(15), expected) ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Exception: Lists differ: [] != ['a(6)'] Second list contains 1 additional elements. First extra element 0: 'a(6)' - [] + ['a(6)'] ====================================================================== FAIL: test_level_2_case_10_mixed_multiple_operations_2 (level_2_tests.Level2Tests.test_level_2_case_10_mixed_multiple_operations_2) ---------------------------------------------------------------------- Traceback (most recent call last): File "/opt/python/3.13.12/lib/python3.13/site-packages/timeout_decorator/timeout_decorator.py", line 82, in new_function return function(*args, **kwargs) File "/usercode/FILESYSTEM/tests/level_2_tests.py", line 229, in test_level_2_case_10_mixed_multiple_operations_2 self.assertEqual(self.db.top_n_parcels(3), expected) ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Exception: Lists differ: [] != ['a(1)'] Second list contains 1 additional elements. First extra element 0: 'a(1)' - [] + ['a(1)'] ---------------------------------------------------------------------- Ran 21 tests in 0.006s FAILED (failures=10)

All of your **Level 1** tests are now passing: ``` ..........FFFFFFFFFF. ^ Level 1 passed ``` Every failing test is from **Level 2**, and every failure is the same symptom: ```python self.db.top_n_parcels(...) ``` returns ```python [] ``` instead of something like ```python ["employee(2)"] ``` This almost always means **one of three things**. ### 1. You never record operation counts You should have something like ```python self.operation_counts = {} ``` in `__init__`. Every successful modification to a key should increment its count. For example, ```python def _record_event(self, key): self.operation_counts[key] = self.operation_counts.get(key, 0) + 1 ``` --- ### 2. You're not calling `_record_event` Every successful modifying operation should call it. For example, ```python def increment(self, key, field, value): ... self._record_event(key) ``` and ```python def delete(self, key, field): ... self._record_event(key) ``` Only successful modifications count. A failed delete should **not** increment. --- ### 3. `top_n_parcels()` isn't using the counts It should resemble ```python def top_n_parcels(self, n): items = sorted( self.operation_counts.items(), key=lambda x: (-x[1], x[0]) ) return [ f"{key}({count})" for key, count in items[:n] ] ``` The sort order is 1. highest count first 2. alphabetical key if tied Example ```python { "foo": 3, "bar": 3, "apple": 1 } ``` becomes ```python [ "bar(3)", "foo(3)", "apple(1)" ] ``` because `"bar"` comes before `"foo"` alphabetically. --- ## One more thing One of the tests is called ``` key_deleted_and_recreated_and_stats ``` That strongly suggests that **deleting a key should not erase its operation count**. For example ``` increment("aaa") increment("aaa") delete(...) ``` Count = 3 If the key is recreated later, ``` increment("aaa") ``` Count becomes ``` 4 ``` not ``` 1 ``` So **don't do this** when deleting the last field: ```python del self.operation_counts[key] # ❌ ``` Instead, only remove the key from your data store: ```python del self.database[key] ``` and leave `operation_counts` untouched. --- If you paste your current `ParcelTrackingSystemImpl` class, especially: - `__init__` - `increment()` - `delete()` - `_record_event()` - `top_n_parcels()` I can identify the exact line causing all 10 failures.

python3 -m unittest discover -s /usercode/FILESYSTEM/tests -p '*.py' 2>&1 ..........FFFFFFFFFF. ====================================================================== FAIL: test_level_2_case_01_simple_increment_and_stats (level_2_tests.Level2Tests.test_level_2_case_01_simple_increment_and_stats) ---------------------------------------------------------------------- Traceback (most recent call last): File "/opt/python/3.13.12/lib/python3.13/site-packages/timeout_decorator/timeout_decorator.py", line 82, in new_function return function(*args, **kwargs) File "/usercode/FILESYSTEM/tests/level_2_tests.py", line 31, in test_level_2_case_01_simple_increment_and_stats self.assertEqual(self.db.top_n_parcels(2), expected) ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Exception: Lists differ: [] != ['employee(2)'] Second list contains 1 additional elements. First extra element 0: 'employee(2)' - [] + ['employee(2)'] ====================================================================== FAIL: test_level_2_case_02_simple_operations_and_stats (level_2_tests.Level2Tests.test_level_2_case_02_simple_operations_and_stats) ---------------------------------------------------------------------- Traceback (most recent call last): File "/opt/python/3.13.12/lib/python3.13/site-packages/timeout_decorator/timeout_decorator.py", line 82, in new_function return function(*args, **kwargs) File "/usercode/FILESYSTEM/tests/level_2_tests.py", line 39, in test_level_2_case_02_simple_operations_and_stats self.assertEqual(self.db.top_n_parcels(1), expected) ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Exception: Lists differ: [] != ['dept4(2)'] Second list contains 1 additional elements. First extra element 0: 'dept4(2)' - [] + ['dept4(2)'] ====================================================================== FAIL: test_level_2_case_03_key_deleted_and_recreated_and_stats (level_2_tests.Level2Tests.test_level_2_case_03_key_deleted_and_recreated_and_stats) ---------------------------------------------------------------------- Traceback (most recent call last): File "/opt/python/3.13.12/lib/python3.13/site-packages/timeout_decorator/timeout_decorator.py", line 82, in new_function return function(*args, **kwargs) File "/usercode/FILESYSTEM/tests/level_2_tests.py", line 61, in test_level_2_case_03_key_deleted_and_recreated_and_stats self.assertEqual(self.db.top_n_parcels(2), expected) ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Exception: Lists differ: [] != ['aaa(3)', 'a(2)'] Second list contains 2 additional elements. First extra element 0: 'aaa(3)' - [] + ['aaa(3)', 'a(2)'] ====================================================================== FAIL: test_level_2_case_04_multiple_fields_within_key_and_stats (level_2_tests.Level2Tests.test_level_2_case_04_multiple_fields_within_key_and_stats) ---------------------------------------------------------------------- Traceback (most recent call last): File "/opt/python/3.13.12/lib/python3.13/site-packages/timeout_decorator/timeout_decorator.py", line 82, in new_function return function(*args, **kwargs) File "/usercode/FILESYSTEM/tests/level_2_tests.py", line 88, in test_level_2_case_04_multiple_fields_within_key_and_stats self.assertEqual(self.db.top_n_parcels(1), expected) ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Exception: Lists differ: [] != ['John(2)'] Second list contains 1 additional elements. First extra element 0: 'John(2)' - [] + ['John(2)'] ====================================================================== FAIL: test_level_2_case_05_simple_operations_and_stats_tie (level_2_tests.Level2Tests.test_level_2_case_05_simple_operations_and_stats_tie) ---------------------------------------------------------------------- Traceback (most recent call last): File "/opt/python/3.13.12/lib/python3.13/site-packages/timeout_decorator/timeout_decorator.py", line 82, in new_function return function(*args, **kwargs) File "/usercode/FILESYSTEM/tests/level_2_tests.py", line 109, in test_level_2_case_05_simple_operations_and_stats_tie self.assertEqual(self.db.top_n_parcels(1), expected) ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Exception: Lists differ: [] != ['orange(1)'] Second list contains 1 additional elements. First extra element 0: 'orange(1)' - [] + ['orange(1)'] ====================================================================== FAIL: test_level_2_case_06_n_exceeds_amount_of_keys (level_2_tests.Level2Tests.test_level_2_case_06_n_exceeds_amount_of_keys) ---------------------------------------------------------------------- Traceback (most recent call last): File "/opt/python/3.13.12/lib/python3.13/site-packages/timeout_decorator/timeout_decorator.py", line 82, in new_function return function(*args, **kwargs) File "/usercode/FILESYSTEM/tests/level_2_tests.py", line 132, in test_level_2_case_06_n_exceeds_amount_of_keys self.assertEqual(self.db.top_n_parcels(2), expected) ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Exception: Lists differ: [] != ['foo(3)', 'boo(2)'] Second list contains 2 additional elements. First extra element 0: 'foo(3)' - [] + ['foo(3)', 'boo(2)'] ====================================================================== FAIL: test_level_2_case_07_empty_database (level_2_tests.Level2Tests.test_level_2_case_07_empty_database) ---------------------------------------------------------------------- Traceback (most recent call last): File "/opt/python/3.13.12/lib/python3.13/site-packages/timeout_decorator/timeout_decorator.py", line 82, in new_function return function(*args, **kwargs) File "/usercode/FILESYSTEM/tests/level_2_tests.py", line 160, in test_level_2_case_07_empty_database self.assertEqual(self.db.top_n_parcels(1), expected) ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Exception: Lists differ: [] != ['key1(1)'] Second list contains 1 additional elements. First extra element 0: 'key1(1)' - [] + ['key1(1)'] ====================================================================== FAIL: test_level_2_case_08_multiple_operations_and_edge_cases_combined (level_2_tests.Level2Tests.test_level_2_case_08_multiple_operations_and_edge_cases_combined) ---------------------------------------------------------------------- Traceback (most recent call last): File "/opt/python/3.13.12/lib/python3.13/site-packages/timeout_decorator/timeout_decorator.py", line 82, in new_function return function(*args, **kwargs) File "/usercode/FILESYSTEM/tests/level_2_tests.py", line 175, in test_level_2_case_08_multiple_operations_and_edge_cases_combined self.assertEqual(self.db.top_n_parcels(5), expected) ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Exception: Lists differ: [] != ['foo(1)', 'key(1)'] Second list contains 2 additional elements. First extra element 0: 'foo(1)' - [] + ['foo(1)', 'key(1)'] ====================================================================== FAIL: test_level_2_case_09_mixed_multiple_operations_1 (level_2_tests.Level2Tests.test_level_2_case_09_mixed_multiple_operations_1) ---------------------------------------------------------------------- Traceback (most recent call last): File "/opt/python/3.13.12/lib/python3.13/site-packages/timeout_decorator/timeout_decorator.py", line 82, in new_function return function(*args, **kwargs) File "/usercode/FILESYSTEM/tests/level_2_tests.py", line 204, in test_level_2_case_09_mixed_multiple_operations_1 self.assertEqual(self.db.top_n_parcels(15), expected) ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Exception: Lists differ: [] != ['a(6)'] Second list contains 1 additional elements. First extra element 0: 'a(6)' - [] + ['a(6)'] ====================================================================== FAIL: test_level_2_case_10_mixed_multiple_operations_2 (level_2_tests.Level2Tests.test_level_2_case_10_mixed_multiple_operations_2) ---------------------------------------------------------------------- Traceback (most recent call last): File "/opt/python/3.13.12/lib/python3.13/site-packages/timeout_decorator/timeout_decorator.py", line 82, in new_function return function(*args, **kwargs) File "/usercode/FILESYSTEM/tests/level_2_tests.py", line 229, in test_level_2_case_10_mixed_multiple_operations_2 self.assertEqual(self.db.top_n_parcels(3), expected) ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Exception: Lists differ: [] != ['a(1)'] Second list contains 1 additional elements. First extra element 0: 'a(1)' - [] + ['a(1)'] ---------------------------------------------------------------------- Ran 21 tests in 0.005s FAILED (failures=10)

The failures haven't changed at all. Every single one still shows: ```python top_n_parcels(...) == [] ``` That tells us something very specific: - Your `top_n_parcels()` method is executing. - The collection it is reading from is **empty**. - None of the modifying operations are ever recording statistics. This is **not** enough information to diagnose the bug, because the test output doesn't include your implementation. The most likely causes are: ```python class ParcelTrackingSystemImpl: def __init__(self): self.database = {} self.operation_counts = {} # <-- Is this here? ``` and ```python def _record_event(self, key): self.operation_counts[key] = self.operation_counts.get(key, 0) + 1 ``` and every successful modification must do ```python self._record_event(key) ``` For example, ```python def increment(...): ... self._record_event(key) ``` and ```python def delete(...): ... self._record_event(key) ``` Finally, ```python def top_n_parcels(self, n): items = sorted( self.operation_counts.items(), key=lambda x: (-x[1], x[0]) ) return [f"{k}({v})" for k, v in items[:n]] ``` --- ### At this point I need to see your code. Please paste your `ParcelTrackingSystemImpl` class (or at least): - `__init__` - `increment()` - `delete()` - `_record_event()` - `top_n_parcels()` Without the implementation, I can only guess. With the code, I can point to the exact line that's causing all 10 failures.