init() — flask Function Reference

Architecture documentation for the __init__() function in scaffold.py from the flask codebase.

Function python ApplicationCore Scaffolding

Entity Profile

ApplicationCore→ Scaffolding→ __init__() — flask Function Reference

Dependency Diagram

graph TD
  736a231a_9025_7df3_3587_be4da4bc2c28["__init__()"]
  a813bd5c_bf41_d926_8dde_6a113d5e0018["Scaffold"]
  736a231a_9025_7df3_3587_be4da4bc2c28 -->|defined in| a813bd5c_bf41_d926_8dde_6a113d5e0018
  style 736a231a_9025_7df3_3587_be4da4bc2c28 fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

src/flask/sansio/scaffold.py lines 75–215

    def __init__(
        self,
        import_name: str,
        static_folder: str | os.PathLike[str] | None = None,
        static_url_path: str | None = None,
        template_folder: str | os.PathLike[str] | None = None,
        root_path: str | None = None,
    ):
        #: The name of the package or module that this object belongs
        #: to. Do not change this once it is set by the constructor.
        self.import_name = import_name

        self.static_folder = static_folder
        self.static_url_path = static_url_path

        #: The path to the templates folder, relative to
        #: :attr:`root_path`, to add to the template loader. ``None`` if
        #: templates should not be added.
        self.template_folder = template_folder

        if root_path is None:
            root_path = get_root_path(self.import_name)

        #: Absolute path to the package on the filesystem. Used to look
        #: up resources contained in the package.
        self.root_path = root_path

        #: A dictionary mapping endpoint names to view functions.
        #:
        #: To register a view function, use the :meth:`route` decorator.
        #:
        #: This data structure is internal. It should not be modified
        #: directly and its format may change at any time.
        self.view_functions: dict[str, ft.RouteCallable] = {}

        #: A data structure of registered error handlers, in the format
        #: ``{scope: {code: {class: handler}}}``. The ``scope`` key is
        #: the name of a blueprint the handlers are active for, or
        #: ``None`` for all requests. The ``code`` key is the HTTP
        #: status code for ``HTTPException``, or ``None`` for
        #: other exceptions. The innermost dictionary maps exception
        #: classes to handler functions.
        #:
        #: To register an error handler, use the :meth:`errorhandler`
        #: decorator.
        #:
        #: This data structure is internal. It should not be modified
        #: directly and its format may change at any time.
        self.error_handler_spec: dict[
            ft.AppOrBlueprintKey,
            dict[int | None, dict[type[Exception], ft.ErrorHandlerCallable]],
        ] = defaultdict(lambda: defaultdict(dict))

        #: A data structure of functions to call at the beginning of
        #: each request, in the format ``{scope: [functions]}``. The
        #: ``scope`` key is the name of a blueprint the functions are
        #: active for, or ``None`` for all requests.
        #:
        #: To register a function, use the :meth:`before_request`
        #: decorator.
        #:
        #: This data structure is internal. It should not be modified
        #: directly and its format may change at any time.
        self.before_request_funcs: dict[
            ft.AppOrBlueprintKey, list[ft.BeforeRequestCallable]
        ] = defaultdict(list)

        #: A data structure of functions to call at the end of each
        #: request, in the format ``{scope: [functions]}``. The
        #: ``scope`` key is the name of a blueprint the functions are
        #: active for, or ``None`` for all requests.
        #:
        #: To register a function, use the :meth:`after_request`
        #: decorator.
        #:
        #: This data structure is internal. It should not be modified
        #: directly and its format may change at any time.
        self.after_request_funcs: dict[
            ft.AppOrBlueprintKey, list[ft.AfterRequestCallable[t.Any]]
        ] = defaultdict(list)