为什么这个Python(Django)代码会占用内存？

Question

为什么这段代码会占用内存？当我运行它时,每个循环都会慢慢消耗更多的内存,而且我有300000个循环.我正在使用Windows和Python 2.6.

def LoadVotes(self):
    old_votes=Votes.objects.all()
    amount=old_votes.count()
    print 'Amount of votes is: ' + str(amount)
    c=0
    for row in old_votes:
        try:
            new_id_user=LegacyUserId.objects.get(legacy_id=row._login)
        except LegacyUserId.DoesNotExist:
            string=" user with old id "+str(row._login)+" does not match new user id /n"
            log=open('log_add_old_votes.txt','a')
            log.write(string)
            continue
        try:
            new_id_media=LegacyMedia.objects.get(legacy_id=row.media_file_id)
        except new_id_media.DoesNotExist:
            log_text='old media with ID:'+str(row.media_file_id)+' is not found in relation with new media \n'
            log=open('log_add_old_votes.txt','a')
            log.write(log_text)
            continue
        mo=MediaObject.objects.get(pk=new_id_media.object_id)
        new_votes_item, created=Mark.objects.get_or_create(user=new_id_user.user, media_object=mo, defaults={'mark':int(row.rate)*2}) 
        c=c+1
        i=amount-c
        print '\rRemain:',
        stdout.write("%d" % i)
        stdout.flush()

Answer 1

如果您使用DEBUG = True运行,则django会将所有查询存储在内存中.尝试在settings.py文件中更改为DEBUG = False.