'int' object has no attribute 'linalg'

import numpy as n
import math as m
 
def bezout(a, b):
    x, xx, y, yy = 1, 0, 0, 1
    while b:
        q = a // b
        a, b = b, a % b
        x, xx = xx, x - xx*q
        y, yy = yy, y - yy*q
    return x
 
 
alphabet = ['0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z','a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z','А','Б','В','Г','Д','Е','Ё','Ж','З','И','Й','К','Л','М','Н','О','П','Р','С','Т','У','Ф','Х','Ц','Ч','Ш','Щ','Ъ','Ы','Ь','Э','Ю','Я','а','б','в','г','д','е','ё','ж','з','и','й','к','л','м','н','о','п','р','с','т','у','ф','х','ц','ч','ш','щ','ъ','ы','ь','э','ю','я','.',',',' ']
STR = input('Введите строку: ')
key = input('Введите ключ: ')
key_matrix = n.eye(int(m.sqrt(len(key))))
t = 0
for i in range (int(m.sqrt(len(key)))):
    for j in range (int(m.sqrt(len(key)))):
        key_matrix[i][j] = float(alphabet.index(key[t]))
        t += 1
n = int(m.ceil(len(STR)/m.sqrt(len(key))))
m = int(m.sqrt(len(key)))
STR_matrix = [[0.0] * m for i in range(n)]
t = 0
for i in range (n):
    for j in range (m):
        try:
            STR_matrix[i][j] = float(alphabet.index(STR[t]))
        except IndexError:
            STR_matrix[i][j] = 130.0
        t += 1
determinant = n.linalg.det(key_matrix)

import string
string.ascii_lowercase + string.ascii_uppercase + string.digits
'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789'

>>> [chr(i) for i in range(0x0410, 0x044f + 1)] + ['Ё','ё']
['А', 'Б', 'В', 'Г', 'Д', 'Е', 'Ж', 'З', 'И', 'Й', 'К', 'Л', 'М', 'Н', 'О', 'П', 'Р', 'С', 'Т', 'У', 'Ф', 'Х', 'Ц', 'Ч', 'Ш', 'Щ', 'Ъ', 'Ы', 'Ь', 'Э', 'Ю', 'Я', 'а', 'б', 'в', 'г', 'д', 'е', 'ж', 'з', 'и', 'й', 'к', 'л', 'м', 'н', 'о', 'п', 'р', 'с', 'т', 'у', 'ф', 'х', 'ц', 'ч', 'ш', 'щ', 'ъ', 'ы', 'ь', 'э', 'ю', 'я', 'Ё', 'ё']
>>>

ascii_digits = string.ascii_lowercase + string.ascii_uppercase + string.digits
cyrillic = ''.join([chr(i) for i in range(0x0410, 0x044f + 1)] + ['Ё','ё'])
alphabet = ascii_digits + cyrillic + ',. '
>>> alphabet
'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789АБВГДЕЖЗИЙКЛМНОПРСТУФХЦЧШЩЪЫЬЭЮЯабвгдежзийклмнопрстуфхцчшщъыьэюяЁё,. '
>>>