{% for message in messages %}
  <p>{{ message }}</p>
{% endfor %}

def account_signup(request):
    if request.method == 'POST':
        nick = request.POST['nick']
        email = request.POST['email']
        password = request.POST['password']

        user_model = get_user_model()
        if user_model.objects.filter(username__iexact=nick).exists():
            data = {'is_taken_nick': nick}
            messages.warning(request, 'Please correct the error below.')
            return render(request, "account/account_signup.html", data)
        if user_model.objects.filter(email__iexact=email).exists():
            messages.warning(request, 'Please correct the error below.')
            data = {'is_taken_email': email}
            return render(request, "account/account_signup.html", data)

        user = User.objects.create_user(username=nick, email=email, password=password)
        user.save()
        return HttpResponse(status=202)
    else:
        """Return template with sign up page."""
        return render(request, "account/account_signup.html")