From 893426be85b2fc174985e9f667a10dd9c209bb90 Mon Sep 17 00:00:00 2001
From: Georg Brandl <georg@python.org>
Date: Sun, 26 Jun 2005 22:53:43 +0000
Subject: [PATCH] backport bug [ 839151 ] attempt to access sys.argv when it
 doesn't exist

---
 Lib/warnings.py | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/Lib/warnings.py b/Lib/warnings.py
index 06d7685ece11..8d8c36d89010 100644
--- a/Lib/warnings.py
+++ b/Lib/warnings.py
@@ -50,7 +50,11 @@ def warn(message, category=None, stacklevel=1):
             filename = filename[:-1]
     else:
         if module == "__main__":
-            filename = sys.argv[0]
+            try:
+                filename = sys.argv[0]
+            except AttributeError:
+                # embedded interpreters don't have sys.argv, see bug #839151
+                filename = '__main__'
         if not filename:
             filename = module
     registry = globals.setdefault("__warningregistry__", {})
-- 
2.47.3