(Numpy Basic) How do I match the number of data and make them appear randomly?

. . . . .
aaas = np.array([]) for file in files2:

    aaa = np.load(file,allow_pickle=True)[0]
    aaas = np.append(aaas,aaa)

print(len(aaas),'aaas' ) . . .

Question) I want to analyze the aaas in the data using this code. However, since the number of aaa is different depending on the data species, So I want to match the data species with the least aaa and randomize the aaa participating in the analysis in the case of more data species.

How can I do this?

It's hard because I'm new to Numpy. If you teach me, I will study hard based on it.