action='append' could be a bit smarter about this

ambv · ambv · commit 42dc1f74646c · 2025-04-18T14:03:47.000+02:00
diff --git a/Lib/test/libregrtest/cmdline.py b/Lib/test/libregrtest/cmdline.py
@@ -569,7 +569,7 @@ def _parse_args(args, **kwargs):
 
     ns.prioritize = [
         test
-        for priority_list in ns.prioritize
+        for priority_list in (ns.prioritize or ())
         for test in priority_list
     ]
 

Original file line number	Diff line number	Diff line change
`@@ -569,7 +569,7 @@ def _parse_args(args, **kwargs):`
`569`	`569`
`570`	`570`	`ns.prioritize = [`
`571`	`571`	`test`
`572`		`- for priority_list in ns.prioritize`
	`572`	`+ for priority_list in (ns.prioritize or ())`
`573`	`573`	`for test in priority_list`
`574`	`574`	`]`
`575`	`575`