Representation of an array in for loop python spyder - beginner

Question

import numpy as np
from matplotlib import pyplot as plt
import math

nu = 0.05
N=1.5
Nt=8192
alpha = pow(math.pi,2)*pow(nu,2)
n=Nt/2
t= np.arange(-n,n)+Nt/6
A=np.arr