old_contents: """
  Kyōkai are simply groups of routes.
  
  They're a simpler way of grouping your routes together instead of having to import your app object manually all of
  the time.
  """
  from kyokai.route import Route
  
  
  class Blueprint(object):
      """
      A Blueprint contains one public method: `bp.route`. It acts exactly the same as a normal route method.
  
      If you set a `url_prefix` in the constructor, this prefix will be added onto your routes.
      """
      def __init__(self, name: str, url_prefix: str=""):
          self._prefix = url_prefix
          self._name = name
  
          self.routes = []
  
          self.errhandlers = {}
  
      def _bp_get_errhandler(self, code: int):
          return self.errhandlers.get(code)
  
      def route(self, regex, methods: list = None, hard_match: bool = False):
          """
          Create an incoming route for a function.
  
          Parameters:
              regex:
                  The regular expression to match the path to.
                  In standard Python `re` forme.
  
                  Group matches are automatically extracted from the regex, and passed as arguments.
  
              methods:
                  The list of allowed methods, e.g ["GET", "POST"].
                  You can check the method with `request.method`.
  
              hard_match:
                  Should we match based on equality, rather than regex?
  
                  This prevents index or lower level paths from matching 404s at higher levels.
          """
          if not methods:
              methods = ["GET"]
          # Override hard match if it's a `/` route.
          if regex == "/":
              hard_match = True
          regex = self._prefix + regex
          r = Route(regex, methods, hard_match)
          r.set_errorhandler_factory(self._bp_get_errhandler)
          self.routes.append(r)
          return r
  
      def _init_bp(self):
          return self.routes
new_contents: """
  Kyōkai are simply groups of routes.
  
  They're a simpler way of grouping your routes together instead of having to import your app object manually all of
  the time.
  """
  from kyokai.route import Route
  
  
  class Blueprint(object):
      """
      A Blueprint contains one public method: `bp.route`. It acts exactly the same as a normal route method.
  
      If you set a `url_prefix` in the constructor, this prefix will be added onto your routes.
      """
      def __init__(self, name: str, url_prefix: str=""):
          self._prefix = url_prefix
          self._name = name
  
          self.routes = []
  
          self.errhandlers = {}
  
      def _bp_get_errhandler(self, code: int):
          return self.errhandlers.get(code)
  
      def route(self, regex, methods: list = None, hard_match: bool = False):
          """
          Create an incoming route for a function.
  
          Parameters:
              regex:
                  The regular expression to match the path to.
                  In standard Python `re` forme.
  
                  Group matches are automatically extracted from the regex, and passed as arguments.
  
              methods:
                  The list of allowed methods, e.g ["GET", "POST"].
                  You can check the method with `request.method`.
  
              hard_match:
                  Should we match based on equality, rather than regex?
  
                  This prevents index or lower level paths from matching 404s at higher levels.
          """
          if not methods:
              methods = ["GET"]
          # Override hard match if it's a `/` route.
          if regex == "/":
              hard_match = True
          regex = self._prefix + regex
          r = Route(regex, methods, hard_match)
          r.set_errorhandler_factory(self._bp_get_errhandler)
          self.routes.append(r)
          return r
  
      def errorhandler(self, code: int):
          """
          Create an error handler for the specified code.
  
          This will wrap the function in a Route.
          """
          r = Route("", [])
          self.errhandlers[code] = r
          return r
  
      def _init_bp(self):
          return self.routes
subject: Add error handler decorator to Blueprints.py