django 默认Path转换器以及自定义转换器

class Year_Converters():
    regex = ‘\d{4}‘
    def to_python(self,value):
        return int(value)

    def to_url(self,value):
        # return ;04d‘ % value
        return str(value)

from django.urls import path,register_converter
from . import views
from . import converters

　#注册转换器
　register_converter(converters.Year_Converters,‘year‘)
  urlpatterns = [
    path(‘show1/<year:arg>‘, views.show1),
]

from django.urls import re_path
urlpatterns = [
    re_path(‘article/(\d+)/‘, views.index),
]

re_path(r‘^show3/(?P<id>\d{4})/‘, views.show3)