how to append a vecor to a vector in python code example

Example: 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)