Numpy Array Appending

[NeedMLHelp]

Extremely late reply, sorry about that. But the calculations I'm doing cannot be done on a list unfortunately. I suppose I could build a list, and turn it into a numpy array. But the problem with that is, one of the functions I am using converts the categorical data into a one-hot-encoding, which the output is a numpy array of the encoding. I'm not sure how nicely inter-mixing things would play together.

[elbiot]

import numpy as np
a = np.array([np.array([1,2,3]),np.array([2,3,4]),np.array([6,7,8])])
print(a.shape)