From 30385c4ef55446d7213fd0da7a8ee35e39127bb7 2011-11-21 23:57:08
From: MinRK <benjaminrk@gmail.com>
Date: 2011-11-21 23:57:08
Subject: [PATCH] fix default value in interactiveshell.ask_yes_no

was True, should be None

closes #1026

---

diff --git a/IPython/core/interactiveshell.py b/IPython/core/interactiveshell.py
index eea851c..39fc975 100644
--- a/IPython/core/interactiveshell.py
+++ b/IPython/core/interactiveshell.py
@@ -2616,7 +2616,7 @@ class InteractiveShell(SingletonConfigurable, Magic):
         """Write a string to the default error output"""
         io.stderr.write(data)
 
-    def ask_yes_no(self,prompt,default=True):
+    def ask_yes_no(self, prompt, default=None):
         if self.quiet:
             return True
         return ask_yes_no(prompt,default)
diff --git a/IPython/core/magic.py b/IPython/core/magic.py
index 0785691..b63ce9c 100644
--- a/IPython/core/magic.py
+++ b/IPython/core/magic.py
@@ -1058,7 +1058,8 @@ Currently the magic system has the following functions:\n"""
             ans = True
         else:
             ans = self.shell.ask_yes_no(
-                "Once deleted, variables cannot be recovered. Proceed (y/[n])? ")
+                "Once deleted, variables cannot be recovered. Proceed (y/[n])? ",
+                default='n')
         if not ans:
             print 'Nothing done.'
             return