import numpy as np

# create 2x2 array
array = np.array([[1,2], [3,4]])

# create list
_list = [[1,2],[3,4]]

# output
array[0][0]
array[0,0]

_list = [0][0]

# create matrix

matrix = np.matrix([[1,2],[3,4]])

# create array from matrix (2D vector)

A = np.array(matrix)

# transpose A matrix

A.T
