how to append to an arrays in python code example

Example 1: python add element to array

my_list = []

my_list.append(12)

Example 2: append vector to vector python

Xa = ['a1','a2','a3']
Xb = ['b1','b2','b3']
Xc = ['c1','b2','b3']

resultArray = []
resultArray.append(Xa)
resultArray.append(Xb)
resultArray.append(Xc)