Index: Lib/curses/__init__.py
===================================================================
--- Lib/curses/__init__.py	(revision 86886)
+++ Lib/curses/__init__.py	(working copy)
@@ -56,4 +56,4 @@
 try:
     has_key
 except NameError:
-    from has_key import has_key
+    from curses.has_key import has_key
Index: Lib/test/test_curses.py
===================================================================
--- Lib/test/test_curses.py	(revision 86886)
+++ Lib/test/test_curses.py	(working copy)
@@ -240,6 +240,7 @@
                          ]:
         if ascii.unctrl(ch) != expected:
             print('curses.unctrl fails on character', repr(ch))
+    test_issue10598()
 
 
 def test_userptr_without_set(stdscr):
@@ -264,6 +265,12 @@
     curses.ungetch(1025)
     stdscr.getkey()
 
+def test_issue10598():
+    import _curses
+    del _curses.has_key
+    del sys.modules['curses']
+    import curses
+
 def main(stdscr):
     curses.savetty()
     try: