Make assertion error be more verbose.

diff --git a/Lib/idlelib/OutputWindow.py b/Lib/idlelib/OutputWindow.py
index 0e8fd6db0a80ec2a30050fdbacda2797ad134bf6..83d5771d7e0e3ad5d3a0b601937aa6208d46b3f1 100644 (file)
--- a/Lib/idlelib/OutputWindow.py
+++ b/Lib/idlelib/OutputWindow.py
@@ -35,7 +35,7 @@ class OutputWindow(EditorWindow):
     # Act as output file
 
     def write(self, s, tags=(), mark="insert"):
-        assert isinstance(s, str)
+        assert isinstance(s, str), repr(s)
         self.text.insert(mark, s, tags)
         self.text.see(mark)
         self.text.update()