[gen] Stop using param 'cmp' in method [].sort (deprecated in Python3). Used para 'key' instead.

gen/calendar.py

@@ -302,7 +302,7 @@ class Calendar(Type):
                             singleRes = (date, event)
                         res.append(singleRes)
         # Sort the result if required
-        if sorted: res.sort(lambda x,y: cmp(x[0], y[0]))
+        if sorted: res.sort(key=lambda x: x[0])
         # Group events spanned on several days if required
         if groupSpanned:
             # Browse events in reverse order and merge them when appropriate

gen/wrappers/__init__.py

@@ -177,9 +177,8 @@ class AbstractWrapper(object):
         refs = getattr(self.o, fieldName, None)
         if not refs: return
         tool = self.tool
-        refs.sort(lambda x,y: cmp(getattr(tool.getObject(x), sortKey),
-                                  getattr(tool.getObject(y), sortKey)))
-        if reverse: refs.reverse()
+        refs.sort(key=lambda x: getattr(tool.getObject(x), sortKey),
+                  reverse=reverse)
 
     def create(self, fieldNameOrClass, noSecurity=False, **kwargs):
         '''If p_fieldNameOrClass is the name of a field, this method allows to