Duplicata Possível:
Profundidade máxima de recursão?

Eu tenho outro problema com o meu código. Estou escrevendo meu primeiro programa em Vpython e tenho que fazer uma simulação de misturar dois gases. Primeiro eu tive um problema com bordas, mas agora, quando as bolas (que representam as partículas de gás) ficam dentro das bordas, há algo errado. Depois de alguns segundos eu recebo um erro, que é mostrado abaixo do código-fonte da minha função. Código:

def MovingTheBall(listOfBalls,position,numCell,flagOfExecution):
    flag = 0
    if flagOfExecution==0:
        positionTmp = position
    else:
        positionTmp = (position[0]+choice([-1,0,1]),position[1]+choice([-1,0,1]),0)
    for i in range( 0, len(listOfBalls) ):
        if positionTmp==listOfBalls[i].pos:
            flag=1


    if flag==1:
        return MovingTheBall(lista,(position[0]+choice([-1,0,1]),position[1]+choice([-1,0,1]),0),numCell,1)
    else:
        if positionTmp[0]==0 or positionTmp[0]>=numCell or positionTmp[0]<=-numCell or positionTmp[1]>=numCell or positionTmp[1]<=-numCell:
            return MovingTheBall(lista,(position[0]+choice([-1,0,1]),position[1]+choice([-1,0,1]),0),numCell,1)

        return positionTmp

o erro é:

    return MovingTheBall(listOfBalls,(position[0]+choice([-1,0,1]),position[1]+choice([-1,0,1]),0),numCell,1)
  File "gaz.txt", line 138, in MovingTheBall
    return MovingTheBall(listOfBalls,(position[0]+choice([-1,0,1]),position[1]+choice([-1,0,1]),0),numCell,1)
  File "gaz.txt", line 138, in MovingTheBall
    return MovingTheBall(listOfBalls,(position[0]+choice([-1,0,1]),position[1]+choice([-1,0,1]),0),numCell,1)
  File "gaz.txt", line 138, in MovingTheBall
    return MovingTheBall(listOfBalls,(position[0]+choice([-1,0,1]),position[1]+choice([-1,0,1]),0),numCell,1)
  File "gaz.txt", line 138, in MovingTheBall
    return MovingTheBall(listOfBalls,(position[0]+choice([-1,0,1]),position[1]+choice([-1,0,1]),0),numCell,1)
  File "gaz.txt", line 138, in MovingTheBall
    return MovingTheBall(listOfBalls,(position[0]+choice([-1,0,1]),position[1]+choice([-1,0,1]),0),numCell,1)
  File "gaz.txt", line 130, in MovingTheBall
    if positionTmp==listOfBalls[i].pos:
RuntimeError: maximum recursion depth exceeded while calling a Python object

Alguém pode pensar em uma maneira de simplificar minha função?

Eu corro a função enquanto loop:

while 1:
        rate(20)
        for i in range(0,len(self.listOfBalls)):
            self.listOfBalls[i].pos=poruszanie(self.listOfBalls,self.listOfBalls[i].pos,self.numCell,0)