lista python

 for a in linhas:
     for c in range(1,len(a)):
         codigo.append(a[0][56:62])
         if c==1:
           codigo.append(a[c][8:50])
         elif c>1 and a[c][8:50] not in clientes:
             v=c-2
             clientes[v]=clientes[v]+","+a[c][8:50]
 print(clientes)