How to make a numpy ndarray from several numpy arrays
If your purpose is to deal with some data analysis from your arrays and have a nice view of it, try this using pandas:

import pandas as pd


df = pd.DataFrame({'distA' : np.array([0.2, 0.3, 0.4]),
                   'distB' : np.array([0.3, 0.4, 0.5])})


df




In the case you want to make computation with vectors, matrixes, tensors, etc .. NumPy is probably a good option. I didn't understand exactly what you've asked, though. Can you explain me what you're asking?