django/tests/check_framework/urls/unique_namespaces.py

from django.urls import include, path

common_url_patterns = (
    [
        path("app-ns1/", include([])),
        path("app-url/", include([])),
    ],
    "common",
)

nested_url_patterns = (
    [
        path("common/", include(common_url_patterns, namespace="nested")),
    ],
    "nested",
)

urlpatterns = [
    path("app-ns1-0/", include(common_url_patterns, namespace="app-include-1")),
    path("app-ns1-1/", include(common_url_patterns, namespace="app-include-2")),
    # 'nested' is included twice but namespaced by nested-1 and nested-2.
    path("app-ns1-2/", include(nested_url_patterns, namespace="nested-1")),
    path("app-ns1-3/", include(nested_url_patterns, namespace="nested-2")),
    # namespaced URLs inside non-namespaced URLs.
    path("app-ns1-4/", include([path("abc/", include(common_url_patterns))])),
]