Bug report #10783: [Processing] ParameterString return "None" as unicode - QGIS Application - QGIS Issue Tracking

Bug report #10783

[Processing] ParameterString return "None" as unicode

Added by Etienne Trimaille about 10 years ago. Updated about 9 years ago.

Status:	Closed
Priority:	Normal
Assignee:	Victor Olaya
Category:	Processing/Core
Affected QGIS version:	master	Regression?:	No
Operating System:		Easy fix?:	No
Pull Request or Patch supplied:	No	Resolution:
Crashes QGIS or corrupts data:	No	Copied to github as #:	19164

Description

Hi,
In the modeler, ParameterString return a "None" value as unicode, not as NoneType.
I guess you want to return an empty unicode, no ?

I think an "else" is missing line 51 in ParameterString.py, isn't it ?

History

#1 Updated by Victor Olaya about 10 years ago

Status changed from Open to Feedback

can you provide an example of a model where you have that problem? I do not understand what the issue is exactly

Thanks!

#2 Updated by Etienne Trimaille about 10 years ago

This my code :

def processAlgorithm(self, progress):
    value = self.getParameterValue(self.WHITE_LIST[layer])            
    print value
    print len(value)
    print value.__class__.__name__

self.WHITE_LIST[layer] is a ParameterString which is defined by a PARAMETER_STRING (ModelerParameterDefinitionDialog) in the modeler.

None
4
unicode

However, if I let the parameterString empty in the algorithm (I deleted the block PARAMETER_STRING in the modeler), I will get the right empty value "".