diff --git a/Lib/doctest.py b/Lib/doctest.py
index 5d186b5..b79db17 100644
--- a/Lib/doctest.py
+++ b/Lib/doctest.py
@@ -318,7 +318,8 @@
     def __init__(self, out):
         self.__out = out
         self.__debugger_used = False
-        pdb.Pdb.__init__(self, stdout=out)
+        # do not play signal games in the pdb
+        pdb.Pdb.__init__(self, stdout=out, nosigint=True)
         # still use input() to get user input
         self.use_rawinput = 1
 
@@ -2528,14 +2529,16 @@
                     exec(f.read(), globs, globs)
             except:
                 print(sys.exc_info()[1])
-                pdb.post_mortem(sys.exc_info()[2])
+                p = pdb.Pdb(nosigint=True)
+                p.reset()
+                p.interaction(None, sys.exc_info()[2])
         else:
             fp = open(srcfilename)
             try:
                 script = fp.read()
             finally:
                 fp.close()
-            pdb.run("exec(%r)" % script, globs, globs)
+            pdb.Pdb(nosigint=True).run("exec(%r)" % script, globs, globs)
 
     finally:
         os.remove(srcfilename)
diff --git a/Lib/test/test_pdb.py b/Lib/test/test_pdb.py
index a778c6c..d861df5 100644
--- a/Lib/test/test_pdb.py
+++ b/Lib/test/test_pdb.py
@@ -29,7 +29,7 @@
     """This tests the custom displayhook for pdb.
 
     >>> def test_function(foo, bar):
-    ...     import pdb; pdb.Pdb().set_trace()
+    ...     import pdb; pdb.Pdb(nosigint=True).set_trace()
     ...     pass
 
     >>> with PdbTestInput([
@@ -69,7 +69,7 @@
     ...     return foo.upper()
 
     >>> def test_function():
-    ...     import pdb; pdb.Pdb().set_trace()
+    ...     import pdb; pdb.Pdb(nosigint=True).set_trace()
     ...     ret = test_function_2('baz')
     ...     print(ret)
 
@@ -168,7 +168,7 @@
     """Test basic commands related to breakpoints.
 
     >>> def test_function():
-    ...     import pdb; pdb.Pdb().set_trace()
+    ...     import pdb; pdb.Pdb(nosigint=True).set_trace()
     ...     print(1)
     ...     print(2)
     ...     print(3)
@@ -297,7 +297,7 @@
     ...     return foo
 
     >>> def test_function():
-    ...     import pdb; pdb.Pdb().set_trace()
+    ...     import pdb; pdb.Pdb(nosigint=True).set_trace()
     ...     ret = test_function_2('baz')
 
     >>> with PdbTestInput([  # doctest: +ELLIPSIS, +NORMALIZE_WHITESPACE
@@ -320,7 +320,7 @@
     -> ret = test_function_2('baz')
     (Pdb) list
       1         def test_function():
-      2             import pdb; pdb.Pdb().set_trace()
+      2             import pdb; pdb.Pdb(nosigint=True).set_trace()
       3  ->         ret = test_function_2('baz')
     [EOF]
     (Pdb) step
@@ -383,7 +383,7 @@
     ...         print('Exception!')
 
     >>> def test_function():
-    ...     import pdb; pdb.Pdb().set_trace()
+    ...     import pdb; pdb.Pdb(nosigint=True).set_trace()
     ...     test_function_2()
     ...     print('Not reached.')
 
@@ -416,7 +416,7 @@
     -> 1/0
     (Pdb) list
       1         def test_function():
-      2             import pdb; pdb.Pdb().set_trace()
+      2             import pdb; pdb.Pdb(nosigint=True).set_trace()
       3  ->         test_function_2()
       4             print('Not reached.')
     [EOF]
@@ -440,7 +440,7 @@
 
     >>> def skip_module():
     ...     import string
-    ...     import pdb; pdb.Pdb(skip=['stri*']).set_trace()
+    ...     import pdb; pdb.Pdb(skip=['stri*'], nosigint=True).set_trace()
     ...     string.capwords('FOO')
 
     >>> with PdbTestInput([
@@ -469,7 +469,7 @@
     >>> def skip_module():
     ...     def callback():
     ...         return None
-    ...     import pdb; pdb.Pdb(skip=['module_to_skip*']).set_trace()
+    ...     import pdb; pdb.Pdb(skip=['module_to_skip*'], nosigint=True).set_trace()
     ...     mod.foo_pony(callback)
 
     >>> with PdbTestInput([
@@ -510,7 +510,7 @@
     """Test that "continue" and "next" work properly in bottom frame (issue #5294).
 
     >>> def test_function():
-    ...     import pdb, sys; inst = pdb.Pdb()
+    ...     import pdb, sys; inst = pdb.Pdb(nosigint=True)
     ...     inst.set_trace()
     ...     inst.botframe = sys._getframe()  # hackery to get the right botframe
     ...     print(1)
@@ -550,7 +550,8 @@
 
 def pdb_invoke(method, arg):
     """Run pdb.method(arg)."""
-    import pdb; getattr(pdb, method)(arg)
+    import pdb
+    getattr(pdb.Pdb(nosigint=True), method)(arg)
 
 
 def test_pdb_run_with_incorrect_argument():
diff --git a/Lib/test/test_zipimport_support.py b/Lib/test/test_zipimport_support.py
index b996e26..b935b3f 100644
--- a/Lib/test/test_zipimport_support.py
+++ b/Lib/test/test_zipimport_support.py
@@ -200,7 +200,7 @@
                         pass
 
                     import pdb
-                    pdb.runcall(f)
+                    pdb.Pdb(nosigint=True).runcall(f)
                     """)
         with temp_dir() as d:
             script_name = make_script(d, 'script', test_src)