bpo-33065: Fix problem debugging user classes with __repr__ method (GH-24183)

If __repr__ uses instance attributes, as normal, and one steps
through the __init__ method, debugger may try to get repr before
the instance attributes exist.  reprlib.repr handles the error.

1 files changed, 3 insertions, 3 deletions

diff --git a/Lib/idlelib/debugger_r.py b/Lib/idlelib/debugger_r.py
index 9dcfc56414..2620443885 100644
--- a/Lib/idlelib/debugger_r.py
+++ b/Lib/idlelib/debugger_r.py
@@ -19,7 +19,7 @@ arguments and return values that cannot be transported through the RPC
 barrier, in particular frame and traceback objects.
 
 """
-
+import reprlib
 import types
 from idlelib import debugger
 
@@ -170,7 +170,7 @@ class IdbAdapter:
     def dict_item(self, did, key):
         dict = dicttable[did]
         value = dict[key]
-        value = repr(value) ### can't pickle module 'builtins'
+        value = reprlib.repr(value) ### can't pickle module 'builtins'
         return value
 
 #----------end class IdbAdapter----------
@@ -390,4 +390,4 @@ def restart_subprocess_debugger(rpcclt):
 
 if __name__ == "__main__":
     from unittest import main
-    main('idlelib.idle_test.test_debugger', verbosity=2, exit=False)
+    main('idlelib.idle_test.test_debugger_r', verbosity=2, exit=False)