Re: [Qgis-user] QGIS custom python function with zero or more args
Hi Frank, thanks for your answer! Yes looks like there is no other way but passing empty strings. That’s what I wanted to avoid but anyway. Regards Benjamin -Ursprüngliche Nachricht- Von: Frank Broniewski [mailto:ha...@frankbroniewski.com] Gesendet: Freitag, 9. März 2018 11:25 An: Fuenfer-Koenigstein.Benjamin extern IT-LN; Qgis-user@lists.osgeo.org Betreff: AW: QGIS custom python function with zero or more args 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 <qgis-user-boun...@lists.osgeo.org> Im Auftrag von fuenfer-koenigstein.benjam...@swm.de Gesendet: Freitag, 9. März 2018 09:19 An: Qgis-user@lists.osgeo.org 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 ___ Qgis-user mailing list Qgis-user@lists.osgeo.org List info: https://lists.osgeo.org/mailman/listinfo/qgis-user Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user ___ Qgis-user mailing list Qgis-user@lists.osgeo.org List info: https://lists.osgeo.org/mailman/listinfo/qgis-user Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
Re: [Qgis-user] QGIS custom python function with zero or more args
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 <qgis-user-boun...@lists.osgeo.org> Im Auftrag von fuenfer-koenigstein.benjam...@swm.de Gesendet: Freitag, 9. März 2018 09:19 An: Qgis-user@lists.osgeo.org 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 ___ Qgis-user mailing list Qgis-user@lists.osgeo.org List info: https://lists.osgeo.org/mailman/listinfo/qgis-user Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user ___ Qgis-user mailing list Qgis-user@lists.osgeo.org List info: https://lists.osgeo.org/mailman/listinfo/qgis-user Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
Re: [Qgis-user] QGIS custom python function with zero or more args
Hi Benjamin, you can do it like this example which only makes a sum of 2 values. Two aruments or only one...: -- @qgsfunction(-1, 'Python') def add_values( values, feature, parent): if len(values) == 2: return values[0]+values[1] elif len(values) == 1: return values[0]+5 @qgsfunction(-1, 'Python') says that you will pass a list of arguments and the function will be in the Python rider. In the code, you can check the number of arguments with getting the length of the list, and then use your default values... hope this helps stefan --- Mit freundlichen Grüßen Stefan Giese Projektleiter/Consultant *** Treffen Sie uns auf der FOSSGIS Konferenz 2018 21.-24. März 2018 in Bonn https://fossgis-konferenz.de/2018/ *** WhereGroup GmbH & Co. KG Schwimmbadstr. 2 79100 Freiburg Germany Fon: +49 (0)761 / 519 102 - 61 Fax: +49 (0)761 / 519 102 - 11 stefan.gi...@wheregroup.com www.wheregroup.com Amtsgericht Bonn, HRA 6788 --- Komplementärin: WhereGroup Verwaltungs GmbH vertreten durch: Olaf Knopp, Peter Stamm --- Am 2018-03-09 09:18, schrieb fuenfer-koenigstein.benjam...@swm.de: 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 ___ Qgis-user mailing list Qgis-user@lists.osgeo.org List info: https://lists.osgeo.org/mailman/listinfo/qgis-user Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user ___ Qgis-user mailing list Qgis-user@lists.osgeo.org List info: https://lists.osgeo.org/mailman/listinfo/qgis-user Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
[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 ___ Qgis-user mailing list Qgis-user@lists.osgeo.org List info: https://lists.osgeo.org/mailman/listinfo/qgis-user Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
