Closing a file

[Duncan Smith]

The following seems to do exactly what I want.  It was suggested by a
computer scientist who knows no Python (but I presume C).  Is 'sys.stdout =
0' a safe way of handling this?


    def acceptsim(self, cost, n):
        t = 10000.0 / n
        if self.cost == 0:
            outputfile = open('simresults.txt', 'w')
            sys.stdout = outputfile
            self.cost = DJT.totalcost(self)
            self.low_cost = self.cost
            self.low_ordering = self.ordering[:]
        while n < 120000:
            if cost > 0:
                p = exp ((-1 / t) * (float(cost) / self.cost))
                if random() > p:
                    print self.cost
                    return 0
                else:
                    self.cost = self.cost + cost
                    print self.cost
                    return 1
            else:
                self.cost = self.cost + cost
                if self.cost < self.low_cost:
                    self.low_cost = self.cost
                    self.low_ordering = self.ordering[:]
                print self.cost
                return 1
        sys.stdout = 0
        return 'stop'