[Tutor] Question about global variables on modules

[Tiago Katcipis]

I know its not such a pretty thing to have global variables but its only
for an exercise my teacher told to do. Its a function to calculate the
results of a matrix using jacob. I want to inside the module (inside a
function on the module )assign a value to a global variable, but the
only way i found to do this inside the own module function is importing
the module inside himself. Is there another way of doing this? its kind
odd to import the module to himself, i think  :-) 

here goes the code

<============>

import lineares_jacob

*ERRO_FINAL = 0.0*

def obter_respostas(matriz, incognitas, erro_max):
  erro = erro_max * 10
  n = len(matriz)
 
  while(erro >= erro_max):
    novas_incognitas = []
    y_um = (2.0 + (1.0 * incognitas[1]) - (1.0 * incognitas[4999])) / 3.0
    novas_incognitas.append(y_um)
   
    for i in range(1 , (n - 1)):
      yi = ( (2.0 * i) + incognitas[i - 1] + incognitas[i + 1] ) / (2.0 + i)
      novas_incognitas.append(yi)
     
    y_cinc_mil = (10000.0 - incognitas[0] + incognitas[4998]) / 5002.0
    novas_incognitas.append(y_cinc_mil)
   
    maior = novas_incognitas[0] - incognitas[0]
   
    for i in range(1, 5000):
      dif = novas_incognitas[i] - incognitas[i]
      if(dif > maior):
        maior = dif
       
    erro = maior
    incognitas = novas_incognitas
     
  *lineares_jacob.ERRO_FINAL = erro*
  return incognitas