Задание с массивами

import numpy as np
a = np.array([[8,13,18,4], [25,3,18,28], [14,15,18,24], [1,2,3,4]]) 
 
first_line = [x*y for x in range(2, 100, 6) for y in range (7, 1, -2)]
second_line = [x ** 0.5 for x in range(1000, 1101, 2)]
third_line = [x**2 for x in range(51)]
 
big_secret = np.array([first_line, second_line, third_line, second_line, first_line])
print(big_secret)

import numpy as np
a = np.array([[8,13,18,4], [25,3,18,28], [14,15,18,24], [1,2,3,4]]) 
 
first_line = [x*y for x in range(2, 100, 6) for y in range (7, 1, -2)]
second_line = [x ** 0.5 for x in range(1000, 1101, 2)]
third_line = [x**2 for x in range(51)]
 
big_secret = np.array([first_line, second_line, third_line, second_line, first_line])
#print(big_secret)
#############
# 1.
a = big_secret[:,:5]
print(a)
print(np.diag(a).sum())
 
# 2.
big_secret[::2,1::2] = 1
big_secret[1::2,::2] = 1
big_secret[::2,::2] = -1
big_secret[1::2,1::2] = -1
print(big_secret)
 
# 3.
a = big_secret[:,-5:]
print(a)
print(np.diag(a).prod())