CODE EXAMPLE FOR PYTHON

pyqt log widget thread safe

class QTextEditLogger(logging.Handler, QtCore.QObject):
    appendPlainText = QtCore.pyqtSignal(str)

def __init__(self, parent):
    super().__init__()
    QtCore.QObject.__init__(self)
    self.widget = QtWidgets.QPlainTextEdit(parent)
    self.widget.setReadOnly(True)
    self.appendPlainText.connect(self.widget.appendPlainText)

def emit(self, record):
    msg = self.format(record)
    self.appendPlainText.emit(msg)