From c3d3f9692d2ac91d064681621240121a9407501d Mon Sep 17 00:00:00 2001
From: Guido van Rossum <guido@python.org>
Date: Thu, 9 Apr 1998 17:53:59 +0000
Subject: [PATCH] Add PyObject_Not().

---
 Include/abstract.h | 12 ++++++++++++
 Include/object.h   |  1 +
 Objects/object.c   | 14 ++++++++++++++
 3 files changed, 27 insertions(+)

diff --git a/Include/abstract.h b/Include/abstract.h
index 975c562280a..3491724e318 100644
--- a/Include/abstract.h
+++ b/Include/abstract.h
@@ -382,6 +382,18 @@ xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx*/
 	 
        */
 
+     /* Implemented elsewhere:
+
+     int PyObject_Not(PyObject *o);
+
+	 Returns 0 if the object, o, is considered to be true, and
+	 1 otherwise. This is equivalent to the Python expression:
+	 not o
+
+	 This function always succeeds.
+	 
+       */
+
      PyObject *PyObject_Type Py_PROTO((PyObject *o));
 
        /*
diff --git a/Include/object.h b/Include/object.h
index f2a83d79709..18cca9f4d41 100644
--- a/Include/object.h
+++ b/Include/object.h
@@ -271,6 +271,7 @@ extern int PyObject_SetAttr Py_PROTO((PyObject *, PyObject *, PyObject *));
 extern int PyObject_HasAttr Py_PROTO((PyObject *, PyObject *));
 extern long PyObject_Hash Py_PROTO((PyObject *));
 extern int PyObject_IsTrue Py_PROTO((PyObject *));
+extern int PyObject_Not Py_PROTO((PyObject *));
 extern int PyCallable_Check Py_PROTO((PyObject *));
 extern int PyNumber_Coerce Py_PROTO((PyObject **, PyObject **));
 extern int PyNumber_CoerceEx Py_PROTO((PyObject **, PyObject **));
diff --git a/Objects/object.c b/Objects/object.c
index 0de095f7491..aa73740c99f 100644
--- a/Objects/object.c
+++ b/Objects/object.c
@@ -470,6 +470,20 @@ PyObject_IsTrue(v)
 	return res;
 }
 
+/* equivalent of 'not v' 
+   Return -1 if an error occurred */
+
+int
+PyObject_Not(v)
+	PyObject *v;
+{
+	int res;
+	res = PyObject_IsTrue(v);
+	if (res < 0)
+		return res;
+	return res == 0;
+}
+
 /* Coerce two numeric types to the "larger" one.
    Increment the reference count on each argument.
    Return -1 and raise an exception if no coercion is possible