Issue35925 Remove trailing commas
#35925 
Files edited: 
- pandas/tests/test_multilevel.py
- pandas/tests/test_nanops.py
- pandas/tests/window/moments/test_moments_consistency_rolling.py
- pandas/tests/window/moments/test_moments_ewm.py
- pandas/tests/window/moments/test_moments_rolling.py
- pandas/tests/window/test_base_indexer.py
- pandas/tests/window/test_pairwise.py
- pandas/tests/window/test_rolling.py
- pandas/tseries/frequencies.py
- pandas/util/_test_decorators.py