def random_walk_animated_2D(n, how_many = 1):

    possible_jumps = np.array([[0, 1], [1, 0], [-1, 0], [0, -1]])
    where_to_go = np.random.randint(4, size = n)
    temp = possible_jumps[where_to_go, :]
    x = np.array([[0, 0]])
    temp1 = np.concatenate((x, temp), axis = 0)
    trajectory = np.cumsum(temp1, axis = 0)

    fig = plt.figure()
    ax = plt.axes(xlim = (np.amin(trajectory, axis = 0)[0], np.amax(trajectory, axis = 0)[0]),
                  ylim = (np.amin(trajectory, axis = 0)[1], np.amax(trajectory, axis = 0)[1]))
    line, = ax.plot([], [], lw = 2)

    def init():
        line.set_data([], [])
        return line,

    def animate(i):
        line.set_data(trajectory[i, 0], trajectory[i, 1])
        return line,

    anim = animation.FuncAnimation(fig, animate, init_func = init,
                                   frames = 200, interval = 30, blit = True)
    plt.show()