use next in _key_by_value

basnijholt · basnijholt · commit 8aacefb91c1e · 2020-04-17T10:27:06.000+02:00
diff --git a/adaptive/runner.py b/adaptive/runner.py
@@ -55,9 +55,7 @@
 
 
 def _key_by_value(dct, value):
-    for k, v in dct.items():
-        if v == value:
-            return k
+    return next((k for k, v in dct.items() if v == value), None)
 
 
 class BaseRunner(metaclass=abc.ABCMeta):
