To allow users to select one column from the QTreeWidget as below. (If you’d like to know how to generate tree widget, check “How to use QTreeWidget() in PySide2” first.)
Windows 10
Python 3.8.7
PySide2 5.15.2
Use SelectionBehavior.
(more…)Though the following is one of the ways to access items of multiple list, an error “index out of range” will occur when the lengths of the lists are different. How can I solve it?
list1 = ["A", "B", "C", "D"]
list2 = [1, 2, 3, 4]
list3 = ["Apple", "Orange", "Banana", "Peach"]
for i in range(len(list1)):
print(list1[i], list2[i], list3[i])The output is as below.
A 1 Apple B 2 Orange C 3 Banana D 4 Peach
To access each n-th item of multiple lists in one for loop.
(more…)To change the default size that is initial size of the window in PySide2.
Windows 10
Python 3.8.7
PySide2 5.15.2
I create a simple window as below.
import sys
from PySide2.QtWidgets import *
class MyMainWindow(QMainWindow):
def __init__(self, parent=None):
super(MyMainWindow, self).__init__(parent)
self._generateUI()
def _generateUI(self):
main_widget = QWidget()
main_layout = QVBoxLayout()
main_widget.setLayout(main_layout)
self.setCentralWidget(main_widget)
button = QPushButton("Button")
main_layout.addWidget(button)
def launch():
app = QApplication.instance()
if not app:
app = QApplication(sys.argv)
widget = MyMainWindow()
widget.show()
app.exec_()
launch()
Use resize() function at first to change the default size.
from PySide2 import QtCore
class MyMainWindow(QMainWindow):
def __init__(self, parent=None):
super(MyMainWindow, self).__init__(parent)
self._generateUI()
self.resize(200, 300)
You can change only width or height of the window using height() or width() to get current size.
def launch():
app = QApplication.instance()
if not app:
app = QApplication(sys.argv)
widget = MyMainWindow()
widget.show()
widget.resize(250, widget.height())
Because the window size is adjusted to the contents of the window, resize after showing the window.
class MyMainWindow(QMainWindow):
def __init__(self, parent=None):
super(MyMainWindow, self).__init__(parent)
self._generateUI()
print(self.width(), self.height())
# output => 640 480
def launch():
app = QApplication.instance()
if not app:
app = QApplication(sys.argv)
widget = MyMainWindow()
widget.show()
print(widget.width(), widget.height())
# output => 200 100Use setFixedSize() to fix the size of window. (You can’t resize the window after using this function.)
class MyMainWindow(QMainWindow):
def __init__(self, parent=None):
super(MyMainWindow, self).__init__(parent)
self.setFixedSize(200, 300)
self._generateUI()
Use setFixedWidth() and setFixedHeight(). If you use setFixedWidth(), you can still change the height of the window.
class MyMainWindow(QMainWindow):
def __init__(self, parent=None):
super(MyMainWindow, self).__init__(parent)
self.setFixedWidth(250)
self._generateUI()