Django - returns single value after for loop while print returns multiple values

I am trying to open an xml file, manipulate and render to response or download file from url. I am doing to return multiple objects, when I say print after for loop, in terminal I see every requested objects comes but when I say return only single object comes both to requested url and to terminal.Here is my code;

def xml(request):
filename = "/usr/..../...."  
programs = x.objects.all()
categories = y.objects.all()

with open(filename,'r+') as f:  

    old = f.read()
    for m,k in itertools.product(categories,programs):
        if k.name_tr == m.name_tr:
            s = old.replace ('titlesss',k.name_tr,1) 
            j= k.introduction_tr
            decoded = BeautifulStoneSoup(j, convertEntities=BeautifulStoneSoup.HTML_ENTITIES)
            x =str(decoded)
            x = unicode(x,"utf-8")
            s = s.replace ("infosss",x,1)
            if  m.id == 310:
                    s = s.replace('idsss',"231",1)
            elif m.id == 308:
                    s = s.replace ('idsss',"230",1)
            elif m.id == 159:
                    s = s.replace ('idsss',"203",1)
            elif m.id == 163:
                    s = s.replace ('idsss',"204",1)
            elif m.id == 280:
                    s = s.replace ('idsss',"212",1)
            elif m.id == 157:
                    s = s.replace ('idsss',"202",1)
            elif m.id == 282:
                    s = s.replace ('idsss',"211",1)
            response = HttpResponse(s,mimetype ="application/force-download")                                                       
            response['Content-Disposition'] = 'attachment; filename=output.xml'
            return response

Once a function 'returns' it terminates. Therefore, your for loop only executes once. You might want to replace the 'return' with an 'yield', thus your function becoming a generator that yields a response at each iteration of the for loop.