_AppCtxGlobals Class — flask Architecture

Source Code

src/flask/ctx.py lines 29–114

class _AppCtxGlobals:
    """A plain object. Used as a namespace for storing data during an
    application context.

    Creating an app context automatically creates this object, which is
    made available as the :data:`.g` proxy.

    .. describe:: 'key' in g

        Check whether an attribute is present.

        .. versionadded:: 0.10

    .. describe:: iter(g)

        Return an iterator over the attribute names.

        .. versionadded:: 0.10
    """

    # Define attr methods to let mypy know this is a namespace object
    # that has arbitrary attributes.

    def __getattr__(self, name: str) -> t.Any:
        try:
            return self.__dict__[name]
        except KeyError:
            raise AttributeError(name) from None

    def __setattr__(self, name: str, value: t.Any) -> None:
        self.__dict__[name] = value

    def __delattr__(self, name: str) -> None:
        try:
            del self.__dict__[name]
        except KeyError:
            raise AttributeError(name) from None

    def get(self, name: str, default: t.Any | None = None) -> t.Any:
        """Get an attribute by name, or a default value. Like
        :meth:`dict.get`.

        :param name: Name of attribute to get.
        :param default: Value to return if the attribute is not present.

        .. versionadded:: 0.10
        """
        return self.__dict__.get(name, default)

    def pop(self, name: str, default: t.Any = _sentinel) -> t.Any:
        """Get and remove an attribute by name. Like :meth:`dict.pop`.

        :param name: Name of attribute to pop.
        :param default: Value to return if the attribute is not present,
            instead of raising a ``KeyError``.

        .. versionadded:: 0.11
        """
        if default is _sentinel:
            return self.__dict__.pop(name)
        else:
            return self.__dict__.pop(name, default)

    def setdefault(self, name: str, default: t.Any = None) -> t.Any:
        """Get the value of an attribute if it is present, otherwise
        set and return a default value. Like :meth:`dict.setdefault`.

        :param name: Name of attribute to get.
        :param default: Value to set and return if the attribute is not
            present.

        .. versionadded:: 0.11
        """
        return self.__dict__.setdefault(name, default)

    def __contains__(self, item: str) -> bool:
        return item in self.__dict__

    def __iter__(self) -> t.Iterator[str]:
        return iter(self.__dict__)