#5727: Restore the ability to use readline when calling into pdb in doctests.

Lib/doctest.py

@@ -318,6 +318,8 @@ class _OutputRedirectingPdb(pdb.Pdb):
         self.__out = out
         self.__debugger_used = False
         pdb.Pdb.__init__(self, stdout=out)
+        # still use input() to get user input
+        self.use_rawinput = 1
 
     def set_trace(self, frame=None):
         self.__debugger_used = True

Misc/NEWS

@@ -475,6 +475,9 @@ C-API
 Library
 -------
 
+- Issue #5727: Restore the ability to use readline when calling into pdb
+  in doctests.
+
 - Issue #6719: In pdb, do not stop somewhere in the encodings machinery
   if the source file to be debugged is in a non-builtin encoding.