Django实现自定义路由转换器

import converters

class IntConverter:
    regex = '[0-9]+'

    def to_python(self, value):
        return int(value)

    def to_url(self, value):
        return str(value)


class StringConverter:
    regex = '[^/]+'

    def to_python(self, value):
        return value

    def to_url(self, value):
        return value


class UUIDConverter:
    regex = '[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}'

    def to_python(self, value):
        return uuid.UUID(value)

    def to_url(self, value):
        return str(value)


class SlugConverter(StringConverter):
    regex = '[-a-zA-Z0-9_]+'


class PathConverter(StringConverter):
    regex = '.+'


DEFAULT_CONVERTERS = {
    'int': IntConverter(),
    'path': PathConverter(),
    'slug': SlugConverter(),
    'str': StringConverter(),
    'uuid': UUIDConverter(),
}


REGISTERED_CONVERTERS = {}


def register_converter(converter, type_name):
    REGISTERED_CONVERTERS[type_name] = converter()
    get_converters.cache_clear()

class FourDigitYearConverter:
    # 定义正则表达式
    regex = '[0-9]{4}'

    def to_python(self, value):
        return value

    def to_url(self, value):
        return '%04d' % value

from django.urls import path,  converters
# 注册自定义转换器
register_converter(converters.FourDigitYearConverter, 'yyyy')  # yyyy是自定义转换器的类型名称
urlpatterns = [
  path('articles/<yyyy:year>', views.articles_yyyy),
]