inverse matrix encryption

matrix.py

import string
import numpy as np
from numpy.linalg import inv

M = [[7,18,5],
     [1,20,23],
     [15,18,11]]
C = np.array([[1,1,2],
              [1,2,2],
              [1,4,3]])

def crypt(x,y):
    global T
    Y = C
    X = M
    T = [[0,0,0],
         [0,0,0],
         [0,0,0]]
    for i in range(len(X)):
        for j in range(len(Y[0])):
           for k in range(len(Y)):
               T[i][j] += X[i][k] * Y[k][j]

def decrypt(x,y):
    global C,M
    I = inv(C)
    C = I
    M = T
    crypt(M,C)
    for i in T:
        for j in i:
	    j=j+10
            for x, y in zip(range(1, 96), string.printable):
                if j==x:
                    print (x,y)

crypt(M,C)
decrypt(M,C)