Bug report #18723

Adding a new function expression that also prints in the console halts QGIS

Added by Tudor Bărăscu almost 5 years ago. Updated almost 5 years ago.

Category:PyQGIS Console
Affected QGIS version:3.1(master) Regression?:No
Operating System:Debian Buster Easy fix?:No
Pull Request or Patch supplied:No Resolution:invalid
Crashes QGIS or corrupts data:Yes Copied to github as #:26610


I have a point layer with 3 points.

I created the following function:

from qgis.core import *
from qgis.gui import *
from random import uniform

@qgsfunction(args='auto', group='QTIBIA Engineering')
def random_records(value1, value2, feature, parent):
    Generates a random value..
    print(value1, value2)
    return uniform(value1, value2)

If I put in the layer label: uniform(0, 100.5) QGIS halts on the third print.
So, printing from the function halts QGIS.


#1 Updated by Nyall Dawson almost 5 years ago

  • Resolution set to invalid
  • Status changed from Open to Closed

This isn't safe to do - better to use the thread safe qgis logger classes, e.g. QgsLogger, QgsMessageLog

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