Python/Django后端使用PIL Image生成头像缩略图

import osfrom django.views.generic import Viewfrom myapp.models import Userfrom PIL import Imagedef make_thumbnail(infile,thumbnail_dir): size = (156, 156) if not os.path.exists(thumbnail_dir):#判断缩略图存储目录是否存在then新建 os.mkdir(thumbnail_dir) outfile = os.path.join( thumbnail_dir, os.path.basename(infile)) try: im = Image.open(infile)#Key Point im.thumbnail(size)#Key Point im.save(outfile, "JPEG")#Key Point return True except IOError, err: print("cannot create thumbnail for", infile,err) return Falseclass Useravatar(View): def __init__(self): self.thumbnail_dir = os.path.join(STATIC_ROOT, 'avatar/thumbnails') self.dest_dir = os.path.join(STATIC_ROOT, 'avatar/origin_imgs') @method_decorator(login_required) def post(self, request): nt_id = request.session.get('nt_id', 'default') user = User.objects.get(pk=nt_id) if User.objects.filter(pk=nt_id).exists() else None avatarImg = request.FILES['avatar'] if not os.path.exists(self.dest_dir):#判断原图存储目录是否存在then新建  os.mkdir(self.dest_dir) dest = os.path.join(self.dest_dir, nt_id+"_avatar.jpg") with open(dest, "wb+") as destination:#先保存原图  for chunk in avatarImg.chunks():  destination.write(chunk) if make_thumb(dest,self.thumbnail_dir):#使用原图创建缩略图  avartaPath = os.path.join(STATIC_URL, 'avatar/thumbnails', nt_id + "_avatar.jpg") else:  avartaPath = os.path.join(STATIC_URL, 'avatar/origin_imgs', nt_id + "_avatar.jpg") User.objects.filter(nt_id=nt_id).update(avatar=avartaPath) return render(request, 'profile.html', {'user': user})