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

[qgib]

Author Name: Tudor Bărăscu (@tudorbarascu)
Original Redmine Issue: 18723
Affected QGIS version: 3.1(master)
Redmine category:pyqgis_console

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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.

[qgib]

Author Name: Nyall Dawson (@nyalldawson)

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

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• resolution was changed from to invalid
• status_id was changed from Open to Closed