Inquire about how to expand an array in Python

# matte wrap code; fm size 3*10*5 
a = zeros(3,10);
fm = [];
for kCh = 1:5
    fm[:,:,kCh] = a;

# Python code, fm size 5*3*10
a = np.zeros((3,10));
fm = [];

for kCh in range(5):
    fm.append(fm_val);

I implemented the matte wrap code above as follows.

Is there a way to expand an array that doesn't use append or extend?

I have to calculate the array, but the size changed when I used the phrase above, so the calculation value changed in the calculation value changed.