Method get

src/trio/_core/_local.py:44–59

Gets the value of this :class:`RunVar` for the current run call.

(self, default: T | type[_NoValue] = _NoValue)

    _default: T | type[_NoValue] = attrs.field(default=_NoValue, alias="default")

    def get(self, default: T | type[_NoValue] = _NoValue) -> T:
        """Gets the value of this :class:`RunVar` for the current run call."""
        try:
            return cast("T", _run.GLOBAL_RUN_CONTEXT.runner._locals[self])
        except AttributeError:
            raise RuntimeError("Cannot be used outside of a run context") from None
        except KeyError:
            # contextvars consistency
            # `type: ignore` awaiting https://github.com/python/mypy/issues/15553 to be fixed & released
            if default is not _NoValue:
                return default  # type: ignore[return-value]

            if self._default is not _NoValue:
                return self._default  # type: ignore[return-value]

            raise LookupError(self) from None

    def set(self, value: T) -> RunVarToken[T]:
        """Sets the value of this :class:`RunVar` for this current run