Ensure periodic saving fires immediately after runner task is finished (#440)

* Ensure periodic saving fires immediately after runner task is finished

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

Author: jbweston

adaptive/runner.py

@@ -839,7 +839,8 @@ def default_save(learner):
         async def _saver():
             while self.status() == "running":
                 method(self.learner)
-                await asyncio.sleep(interval)
+                # No asyncio.shield needed, as 'wait' does not cancel any tasks.
+                await asyncio.wait([self.task], timeout=interval)
             method(self.learner)  # one last time
 
         self.saving_task = self.ioloop.create_task(_saver())

docs/source/tutorial/tutorial.IntegratorLearner.md

@@ -4,7 +4,7 @@ jupytext:
     extension: .md
     format_name: myst
     format_version: 0.13
-    jupytext_version: 1.14.5
+    jupytext_version: 1.14.7
 kernelspec:
   display_name: python3
   name: python3
@@ -86,9 +86,7 @@ if not runner.task.done():
 
 ```{code-cell} ipython3
 print(
-    "The integral value is {} with the corresponding error of {}".format(
-        learner.igral, learner.err
-    )
+    f"The integral value is {learner.igral} with the corresponding error of {learner.err}"
 )
 learner.plot()
 ```