python declare variable type array

1#arrays and lists are different
2#numpy arrays are faster
3this_is_a_list = [1, 2, 3]
4import numpy #is you do not have it do pip install numpy
5this_is_an_array = numpy.array([1, 2, 3])

1a :[str] = []
2a.append("abc")
3a.append("123")
4
5print(a)