Which method for arrays is faster ?

[thunderspeed]

Hello everyone,
I hope you are well.

I wonder which of those two methods for dealing with arrays would be faster in python:
method 1: define array at the beginning of the code as np.zeros for example, then fill the elements x[1] , x[2] ... etc, within the code.
method 2: define array at the beginning of the code as empty array: x = [] , and then fill the elements x[1] , x[2] ... etc, within the code.

Thanks