QGIS crashes when I do "print (field_name)"

[qgib]

Author Name: Babacar FASSA (@Babacarfassa)
Original Redmine Issue: 20892
Affected QGIS version: 3.4.2
Redmine category:python_bindings_/_sipify

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Hello,

i have a problem when i run this code. Can some one help.

User Feedback

shape_boite = self.parameterAsSource(parameters, self.BOITE, context)
shape_point_technique = self.parameterAsSource(parameters, self.PT, context)
shape_cables = self.parameterAsSource(parameters, self.CABLE, context)
field_name=self.parameterAsFields(parameters, self.testfield, context)
print (field_name)

when i print field_name, qgis crached

Report Details

Crash ID: c27feb63aef8c3825e8e636c714477104066e3e8

Stack Trace

QRasterPaintEngine::penChanged :
QPainter::setPen :
QsciScintillaBase::inputMethodQuery :
QsciScintillaBase::inputMethodQuery :
QsciStyledText::text :
QsciStyledText::text :
QsciStyledText::text :
QsciStyledText::text :
QsciScintillaBase::inputMethodQuery :
PyInit_Qsci :
QWidget::event :
QFrame::event :
PyInit_Qsci :
QCoreApplicationPrivate::sendThroughObjectEventFilters :
QApplicationPrivate::notify_helper :
QApplication::notify :
QgsApplication::notify :
QCoreApplication::notifyInternal2 :
QWidgetPrivate::drawWidget :
QApplication::windowIcon :
QWidget::event :
QgisApp::event :
QApplicationPrivate::notify_helper :
QApplication::notify :
QgsApplication::notify :
QCoreApplication::notifyInternal2 :
QCoreApplicationPrivate::sendPostedEvents :
qt_plugin_query_metadata :
QEventDispatcherWin32::processEvents :
TranslateMessageEx :
TranslateMessage :
QEventDispatcherWin32::processEvents :
qt_plugin_query_metadata :
QEventLoop::exec :
QCoreApplication::exec :
main :
BaseThreadInitThunk :
RtlUserThreadStart :

QGIS Info
QGIS Version: 3.4.2-Madeira
QGIS code revision: 22034aa
Compiled against Qt: 5.11.2
Running against Qt: 5.11.2
Compiled against GDAL: 2.3.2
Running against GDAL: 2.3.2

System Info
CPU Type: x86_64
Kernel Type: winnt
Kernel Version: 6.1.7601

[qgib]

Author Name: Giovanni Manghi (@gioman)

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• crashes_corrupts_data was changed from 0 to 1
• priority_id was changed from Normal to High
• category_id was changed from Unknown to Python bindings / sipify
• subject was changed from Qgis crached when i print fieldname to QGIS crashes when I do "print (field_name)"

[qgib]

Author Name: Nyall Dawson (@nyalldawson)

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Don't use "print" from a background thread - it's not thread safe. Use the feedback object instead.

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

[qgib]

Author Name: Babacar FASSA (@Babacarfassa)

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Thanks you Nyall for the responds.