Django反向导致url循环导入,为什么？

我收到此错误:

包含的urlconf'fourraxis.urls'似乎没有任何模式.如果您在文件中看到有效模式,则问题可能是由循环导入引起的.

我知道url模式中有一些内容,它看起来像这样:

from django.conf.urls import include, url
from django.contrib import admin

    urlpatterns = [
        url(r'^perfil/', include('clientes.urls'), namespace="cliente"),
        url(r'^admin/', include(admin.site.urls))
    ]

clientes.urls:

from django.conf.urls import url
from django.contrib.auth import views as auth_views

from clientes import views

urlpatterns = [
        # login
        url(r'^login/$', auth_views.login, {'template_name': 'perfiles/login.html'}, name="login"),
        url(r'^logout/$', auth_views.logout, {'template_name': 'perfiles/logged_out.html'}, name="login"),

        url(r'^mi_perfil/$', views.mi_perfil, name="mi_perfil"),
        url(r'^registro_usuario/$', views.RegistroUsuario.as_view(), name="registro_usuario")
    ]

RegistroUsuario视图如下所示:

class RegistroUsuario(FormView):
    template_name = "perfiles/registro_usuario.html"
    form_class = UserCreationForm
    success_url = reverse("cliente:mi_perfil")  # THIS REVERSE

    def form_valid(self, form):
        return redirect("cliente:mi_perfil")

    context = {'form': UserCreationForm}

我知道我可以用这样reverse的纯文本网址替换它perfil/mi_perfil.但是,我想知道为什么这种情况发生逆转,我无法找到关于de docs的解释.另外,使用reverse是更好的,因为它是动态的(如果我改变url,只要它保持其名称,它仍然有效).

在reverse()导入视图时进行调用,这可能是在首次加载urlconf时.您需要使用reverse_lazy():

from django.core.urlresolvers import reverse_lazy

class RegistroUsuario(FormView):
    template_name = "perfiles/registro_usuario.html"
    form_class = UserCreationForm
    success_url = reverse_lazy("cliente:mi_perfil")  # THIS REVERSE

    def form_valid(self, form):
        return redirect("cliente:mi_perfil")

    context = {'form': UserCreationForm}