Hi Benjamin,
I don't have a recipe for no argument, but you can pass an empty string as a
workaround:
@qgsfunction(args="auto", group="Custom")
def myfunc(value, feature, parent):
if not value:
value = "Wert"
return value
Dipl. Geogr. Frank Broniewski
Waldhölzbacher Str. 51
66679 Losheim am See
06872 509 068 4
0176 611 26 9 2 6
www.frankbroniewski.com
-----Ursprüngliche Nachricht-----
Von: Qgis-user <[email protected]> Im Auftrag von
[email protected]
Gesendet: Freitag, 9. März 2018 09:19
An: [email protected]
Betreff: [Qgis-user] QGIS custom python function with zero or more args
Hi all,
I would like to write a custom python function for QGIS 2.18 that takes zero or
one argument. The reason is that in most cases I can use a default value in the
function, in some cases I would like to enter the value as argument. For python
I know that you can prefix args in functions to make them optional, e.g. def
func(*arg). For QGIS functions this will not work because there always have to
be the args feature and parent in last two positions. Has anyone experience
with QGIS functions that take zero or more arguments? Thanks for any help!
Regards
Benjamin
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