import pandas as pd
df = pd.DataFrame(np.random.randint(0, 10, size=(100, 2)), columns=['type',
    'subtype'])
counts = pd.crosstab(df.type, df.subtype)
print(counts.loc[0, [2, 3, 5, 6]].sum() + counts.loc[5, [3, 4, 7, 8]].sum())
Pandas OR statement ending in series contains