django/tests/urlpatterns/path_base64_urls.py

from django.urls import include, path, register_converter

from . import converters, views

register_converter(converters.Base64Converter, 'base64')

subpatterns = [
    path('<base64:value>/', views.empty_view, name='subpattern-base64'),
]

urlpatterns = [
    path('base64/<base64:value>/', views.empty_view, name='base64'),
    path('base64/<base64:base>/subpatterns/', include(subpatterns)),
    path('base64/<base64:base>/namespaced/', include((subpatterns, 'namespaced-base64'))),
]