How can I test if a reference is null ?
Alex Martelli
aleax at aleax.it
Thu Mar 27 10:50:01 EST 2003
cudjoe wrote:
> On a Java GUI, I need to test if a label contains an Icon, I wrote
> those few lines in Jython (similar):
>
>
> tabComp = panel.getComponents()
> trouve = false
> for com in tabComp:
> if isinstance(com, JLabel):
> icon = com.getIcon()
> if( icon != NULL ): ##### doesn't work !
> trouve = true
>
> I know that there are no types in python, but how can we test if a
> variable is empty ?
I believe the test you want is
if icon is not None:
(no redundant parentheses please!). Can't check 'cause my
Jython has mysteriously broken recently, but...
Alex
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