Efficient way to assign list elements to numpy array

Question

I have some numpy array objects in a list that I want to combine to a single numpy array. What is an efficient way to do this? The code below does not work since it puts a list into a numpy array...

import numpy as np


C = [np.array([1,2,3]), np.array([4,5,6]), np.array([7,8,9])]

M = np.zeros((1,3*3))

M[0] = C ## THIS THROWS AN ERROR

Answer 1

Use the following code

print(np.append(C,[]))

[1. 2. 3. 4. 5. 6. 7. 8. 9.]