Error in code NameError: name ' ' is not defined

[Jeff_F]

Try declaring the variable numb.. that should fix it. I tried the code and here's where I put it.

#print(m)
numb = 0
for i in range(0, m):

    x = i
    y = i + 1

    numb.x=int(str(lista[0 + i*4]) + str(lista[2 + i*4]))
    numb.y=int(str(lista[1 + i * 4]) + str(lista[3 + i * 4]))

    numb.i= (numb.x) + (numb.y)

    chr(a.i)
    print(chr(a.i), end=" ")