I have problem with loading boolean from ini
file in PyQt5
app.
#!/usr/bin/python3
# -*- coding: utf-8 -*-
import sys
from PyQt5 import QtCore
from PyQt5.QtCore import QSettings, QVariant
from PyQt5.QtWidgets import (
QApplication, QCheckBox, QDialog, QGridLayout,
QLabel, QLayout, QPushButton
)
class Settings(QDialog):
"settings GUI"
_settings = None
def __init__(self):
super(Settings, self).__init__()
self._ui()
def _ui(self):
self._chk_test = QCheckBox()
self._chk_test.setText("test checkbox")
self._settings = QSettings("settings.ini", QSettings.IniFormat)
self._settings.setFallbacksEnabled(False)
# load configuration
self._chk_test.setChecked(
self._bool(self._settings.value("test_value", True)))
# save settings
btn_save = QPushButton("save")
btn_save.clicked.connect(self._save_settings)
# setting layouts
grid_layout = QGridLayout()
grid_layout.addWidget(self._chk_test, 0, 0, 1, 1)
grid_layout.addWidget(btn_save, 0, 1, 1, 1)
grid_layout.setSizeConstraint(QLayout.SetFixedSize)
grid_layout.setHorizontalSpacing(100)
grid_layout.setVerticalSpacing(5)
self.setWindowTitle("Boolean")
self.setLayout(grid_layout)
self.show()
def _save_settings(self):
self._settings.setValue("test_value", self._chk_test.isChecked())
self.close()
def _bool(self, str):
if str == "true":
return True
else:
return False
if __name__ == "__main__":
app = QApplication(sys.argv)
ui = Settings()
sys.exit(app.exec_())
When I'm try to load boolean using
self._settings.value("test_value", True).toBool()
or
QVariant(self._settings.value("test_value", True)).toBool()
I'm getting AttributeError:
'str' / 'QVariant' object has no attribute 'toBool()'.
I've written custom _bool
method but I'm wondering if there's better way to solve it.
They add third argument type=
to set type for result. So you can use type=bool
and get Python True/False
instead of string "true"/"false"
a = self._settings.value("test_value", True, type=bool)
print('a:', type(a), a)
b = self._settings.value("test_value", True)
print('b:', type(b), b)
result
a: <class 'bool'> True
b: <class 'str'> true
Found in Google: https://riverbankcomputing.com/pipermail/pyqt/2011-January/029032.html
- Added the optional type keyword argument to QSettings.value() to allow the type of the returned value to be specified.