df = pd.DataFrame({'2000-1': [1, 3, 5], '2000-2': [5, 3, 6], '2000-3': [7, 
    8, 9], '2000-4': [1, 3, 5], '2000-5': [5, 3, 6], '2000-6': [7, 8, 9],
    '2000-7': [1, 3, 5], '2000-8': [5, 3, 6], '2000-9': [7, 4, 3], 'A': [1,
    2, 3], 'B': [4, 5, 6], 'C': [7, 8, 9]})
print(df)
Slicing multiple ranges of columns in Panda