df.count() exclude 0, -1, null values

Question

df.count() exclude 0, -1, null values

dataxx = {\'A\':[-1, 35, 15, -1, 20],
        \'B\':[-1, 29, 30, np.nan, 0],
        \'C\': [20, np.nan, 10, 20, 10],