Method set

src/trio/_core/_local.py:61–76

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

(self, value: T)

            raise LookupError(self) from None

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

        """
        try:
            old_value = self.get()
        except LookupError:
            token = RunVarToken._empty(self)
        else:
            token = RunVarToken[T]._create(self, old_value)

        # This can't fail, because if we weren't in Trio context then the
        # get() above would have failed.
        _run.GLOBAL_RUN_CONTEXT.runner._locals[self] = value
        return token

    def reset(self, token: RunVarToken[T]) -> None:
        """Resets the value of this :class:`RunVar` to what it was