Treino para manipulação de arquivo

mat=[[9,2,5],[7,6,3],[1,8,4]]
for i in range(len(mat)):
    print(mat[i])
print()

def espelha(n):
    x=[]
    for i in range(len(n)):
        x.append(n[i][::-1])
    for i in range(len(n)):
        print(x[i])
    print('')

def inverte(n):
    j = len(n)-1
    x = []
    for i in range(len(n)):
        x.append(n[j][::-1])
        j += -1
    for i in range(3):
        print(x[i])
    print()

def complemento(n):
    x=[]
    for i in range(len(n)):
        z=[]
        for y in n[i]:
            j = 10-y
            z.append(j)
        x.append(z)
    for i in range(3):
        print(x[i])


espelha(mat)
inverte(mat)
complemento(mat)