instead of sys.argv[0]

Signed-off-by: Philipp Hahn <hahn@univention.de>
---
 examples/event-test.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/examples/event-test.py b/examples/event-test.py
index 646ce50..ab1da4a 100755
--- a/examples/event-test.py
+++ b/examples/event-test.py
@@ -667,7 +667,7 @@ def myConnectionCloseCallback(conn, reason, opaque):
     run = False
 
 def usage():
-    print("usage: "+os.path.basename(sys.argv[0])+" [-hdl] [uri]")
+    print("usage: %s [-hdl] [uri]" % (os.path.basename(__file__),))
     print("   uri will default to qemu:///system")
     print("   --help, -h   Print this help message")
     print("   --debug, -d  Print debug output")
-- 
2.11.0

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