Fixed #1137 -- Added a _contains_() method to SessionWrapper. Thanks, Brant

git-svn-id: http://code.djangoproject.com/svn/django/trunk@1793 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/middleware/sessions.py

@@ -11,6 +11,9 @@ class SessionWrapper(object):
         self.session_key = session_key
         self.modified = False
 
+    def __contains__(self, key):
+        return key in self._session
+
     def __getitem__(self, key):
         return self._session[key]
 

docs/sessions.txt

@@ -34,6 +34,9 @@ it and write to it.
 
 It implements the following standard dictionary methods:
 
+    * ``__contains__(key)``
+      **New in Django development version.** Example: ``'fav_color' in request.session``
+
     * ``__getitem__(key)``
       Example: ``fav_color = request.session['fav_color']``