[PyKDE] Null pointer test

[Gordon Tyler]

Ingo Krabbe wrote:
> When I want to go a level up I do:
> 
> 	parent = parent.parent()
> 
> But this only works if we aren't at the root node since a QListViewItem
> isn't a QObject but opens an own base class.  So
> 
> 	parent.parent() would give NULL in C++.
> 
> What's returned in pyqt here ?

The Python equivalent of C/C++'s NULL is None. So you would do something 
like this:

parent = parent.parent()
if not parent is None:
     # do stuff with parent

None evaluates to false in an if expression so you could shorten it to:

if parent:
     # do stuff with parent

Ciao,
Gordon