add a comment about using a generator expression

python-adaptive · Apr 24, 2020 · c7a12a4 · c7a12a4
1 parent 5ba052c
commit c7a12a4
Showing 1 changed file with 1 addition and 0 deletions.
diff --git a/adaptive/runner.py b/adaptive/runner.py
@@ -171,6 +171,7 @@ def do_log(self):
 
     def _ask(self, n):
         pending_ids = self._pending_tasks.values()
+        # using generator here because we only need until `n`
         pids_gen = (pid for pid in self._to_retry.keys() if pid not in pending_ids)
         pids = list(itertools.islice(pids_gen, n))