HttpResponseRedirect(reverse("xxx")) 出现NoReverseMatch错误

在应用app的views.py中，用HTTPResponseRedirect重定向reverse反向解析函数的url出现如下NoReverseMatch错误：

from django.shortcuts import render, redirect
from django.http import HttpResponseRedirect
from django.http import HttpResponse
import os
from app.forms import MomentForm, CommentForm
from django.urls import reverse
from django.views.decorators.csrf import csrf_exempt 

# Create your views here.

def welcome(request):
    return HttpResponse("<h1>Welcome to my site!nige sb POST提交成功！</h1>")

@csrf_exempt   #暂时屏蔽csrf
def moments_input(request):
    if request.method == 'POST':
        form = MomentForm(request.POST)
        if form.is_valid():
            print("posting!")
            moment = form.save()
            moment.save()
            return HttpResponseRedirect(reverse("app.views.welcome"))
            # return HttpResponse("<h1>Welcome to my site!nige sb POST提交成功！</h1>")

    else:
        form = MomentForm()

    PROJECT_ROOT = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
    return render(request, os.path.join(PROJECT_ROOT, 'app/templates', 'moments_input.html'), {'form':form})

当表单提交时，会出现如下错误：

原因是因为reverse的使用方法的错误，下面是reverse的函数定义：

reverse(viewname, urlconf=None, args=None, kwargs=None, current_app=None)

viewname为views.py中视图函数名即可，无需加""号，我的解决方法就是将reverse("app.views.welcome")改成reverse(welcome)即可