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Hey folks, This tutorial will help you to close a window in PyQt5 in Python. This can be achieved by using a simple method of the QWidget class. We will use that method and learn how to achieve our goal in a few ways. So for this, we are going to use some libraries of Python namely: PyQt5 and sys.
Using:
from PyQt5.QtCore import * from PyQt5.QtGui import * from PyQt5.QtWidgets import * import sys
How to close a window in PyQt5
To close a window in PyQt5 we use the .close() method on that window. We can simply achieve this by calling the .close() method whenever we want to close the window or by some following ways:
- Calling the .close() method whenever needed.
- Binding to a PushButton to trigger the .close() method.
- Creating a QAction and adding it to the window to trigger the .close() method.
Calling the .close() method whenever needed
Create your PyQt5 application and just call the .close() method whenever that window needs closing. For example:
from PyQt5.QtCore import *
from PyQt5.QtGui import *
from PyQt5.QtWidgets import *
import sys
class MainWindow(QMainWindow):
def __init__(self):
super().__init__()
self.setWindowTitle("Close Window")
self.l1=QLabel("Let's Close this Window")
self.l1.setAlignment(Qt.AlignCenter)
self.setCentralWidget(self.l1)
self.close() #Closes the window at this point
app=QApplication(sys.argv)
window=MainWindow()
window.show()
app.exec_()
The above program creates a simple PyQt5 application with a QLabel as its central widget and then finally, closes it. So the window will be created, the widget will be added but it won’t be displayed as it was closed as soon as it was created.
NOTE: The above-mentioned program is just a demonstration on how to use .close() method when needed to close a window. It’s not a full-flexed application. So nothing will be displayed as mentioned earlier.
Binding to a PushButton to trigger the .close() method
In this way of closing the window, we create a QPushButton() and then bind a function(to close the window) to it which is triggered when that button is clicked. For example:
from PyQt5.QtCore import *
from PyQt5.QtGui import *
from PyQt5.QtWidgets import *
import sys
class MainWindow(QMainWindow):
def __init__(self):
super().__init__()
self.setWindowTitle("Close Window")
self.b1=QPushButton("Let's Close this Window")
self.b1.clicked.connect(lambda:self.close()) #function binded to the button self.b1
self.setCentralWidget(self.b1)
app=QApplication(sys.argv)
window=MainWindow()
window.show()
app.exec_()
The above program creates a simple PyQt5 application with a QPushButton() as its central widget and then binds a function to trigger on click. The function is a simple lambda function that calls the self.close() method.It’s bound to QPushButton() using the .clicked.connect() method.So when the button is clicked the window closes.
Creating a QAction and adding it to the window to trigger the .close() method
In this way of closing the window, we create a QAction() and then add that action to the window we want to close using the .addAction() method. For example:
from PyQt5.QtCore import *
from PyQt5.QtGui import *
from PyQt5.QtWidgets import *
import sys
class MainWindow(QMainWindow):
def __init__(self):
super().__init__()
self.setWindowTitle("Close Window")
self.l1=QLabel("Let's Close this Window")
self.l1.setAlignment(Qt.AlignCenter)
self.setCentralWidget(self.l1)
self.exit=QAction("Exit Application",shortcut=QKeySequence("Ctrl+q"),triggered=lambda:self.exit_app)
self.addAction(self.exit)
def exit_app(self):
print("Shortcut pressed") #verification of shortcut press
self.close()
app=QApplication(sys.argv)
window=MainWindow()
window.show()
app.exec_()
The above program creates a simple PyQt5 application with a QLabel as its central widget. Then a QAction() is created with some parameters like the name of the action, shortcut and triggered. Where shortcut is the key or key sequence that is needed to be pressed to trigger that action. Also, the triggered parameter is where the function to call on that action being triggered is specified. Then that action is added to the window which needs to be closed using the .addAction() So when the shortcut specified(i.e. Ctrl+q ) is pressed, as expected, the window closes.
Also read:
Digital stopwatch GUI Application in Python – PyQt5
The simplest way to close a window is to click the right (Windows) or left (macOS) ‘X’ button on the title bar. Now let’s see how to close the window through programming. We’ll also take a quick talk about signals and slots.
Related course: Create Desktop Apps with Python PyQt5
Close the window.
The program below creates a button. If you click the button, it will close the program. It closes the program programatically.
import sys
from PyQt5.QtWidgets import QApplication, QWidget, QPushButton
from PyQt5.QtCore import QCoreApplication
class MyApp(QWidget):
def __init__(self):
super().__init__()
self.initUI()
def initUI(self):
btn = QPushButton('Quit', self)
btn.move(50, 50)
btn.resize(btn.sizeHint())
btn.clicked.connect(QCoreApplication.instance().quit)
self.setWindowTitle('Quit Button')
self.setGeometry(300, 300, 300, 200)
self.show()
if __name__ == '__main__':
app = QApplication(sys.argv)
ex = MyApp()
sys.exit(app.exec_())
You have created a ‘Quit’ button. Now click this button to exit the application.
Description
from PyQt5.QtCore import QCoreApplication
Load the QCoreApplication class for the QtCore module.
btn = QPushButton('Quit', self)
Create one pushbutton.
This button (btn) is an instance of the QPushButton class.
For the first parameter of the constructor QPushButton(), is the text that will appear on the button, and the second parameter enters the parent widget where the button will be located.
btn.clicked.connect(QCoreApplication.instance().quit)
Event processing in PyQt5 is done with the signals and slot mechanism. Clicking the button (btn) will create a ‘clicked’ signal. The instance() method returns the current instance.
The ‘clicked’ signal is connected to the quit() method that exits the application.
QCoreApplication.instance().quit
This allows communication between the sender and receiver, both objects. In this example, the sender is a QPushbutton (btn) and the receiver is an application object (app).
Related course: Create Desktop Apps with Python PyQt5
Столкнулся с проблемой, что при закрытии главного окна диалоговые не закрываются. Как решить эту проблему?
Пример основного окна:
from PyQt5 import QtCore, QtGui, QtWidgets
import test_dialog
class Ui_Form(object):
def setupUi(self, Form):
Form.setObjectName("Form")
Form.resize(400, 300)
self.pushButton = QtWidgets.QPushButton(Form)
self.pushButton.setGeometry(QtCore.QRect(150, 140, 75, 23))
self.pushButton.setObjectName("pushButton")
self.retranslateUi(Form)
QtCore.QMetaObject.connectSlotsByName(Form)
def retranslateUi(self, Form):
_translate = QtCore.QCoreApplication.translate
Form.setWindowTitle(_translate("Form", "Form"))
self.pushButton.setText(_translate("Form", "PushButton"))
class MyWin(QtWidgets.QWidget, Ui_Form):
def __init__(self):
super().__init__()
self.setupUi(self)
self.pushButton.clicked.connect(lambda: test_dialog.main())
if __name__ == "__main__":
import sys
app = QtWidgets.QApplication(sys.argv)
w = MyWin()
w.show()
sys.exit(app.exec_())
Диалоговое окно:
from PyQt5 import QtCore, QtGui, QtWidgets
class Ui_Dialog(object):
def setupUi(self, Dialog):
Dialog.setObjectName("Dialog")
Dialog.resize(400, 300)
self.retranslateUi(Dialog)
QtCore.QMetaObject.connectSlotsByName(Dialog)
def retranslateUi(self, Dialog):
_translate = QtCore.QCoreApplication.translate
Dialog.setWindowTitle(_translate("Dialog", "Dialog"))
class MyWin(QtWidgets.QDialog, Ui_Dialog):
def __init__(self):
super().__init__()
self.setupUi(self)
def main():
w = MyWin()
w.show()
w.exec_()
Last Updated :
26 Mar, 2020
In this article, we will see how to use close() method which belongs to the QWidget class, this method is used to close the window in PyQt5 application. In other words by close() method the window get closed without manually closing it.
Syntax : self.close()
Argument : It takes no argument.
Code :
from PyQt5.QtWidgets import *
from PyQt5 import QtCore
from PyQt5 import QtGui
import sys
import time
class Window(QMainWindow):
def __init__(self):
super().__init__()
self.setWindowTitle("Close")
self.setGeometry(0, 0, 400, 300)
self.label = QLabel("Icon is set", self)
self.label.move(100, 100)
self.label.setStyleSheet("border: 1px solid black;")
self.show()
time.sleep(2)
self.close()
App = QApplication(sys.argv)
window = Window()
sys.exit(App.exec())
This will open the window and after 2 seconds it will automatically closes the window.
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PyQt5 — это набор Python-модулей, который позволяет создавать графические интерфейсы пользователя (GUI) для приложений. В PyQt5 имеется несколько способов закрыть окно, в зависимости от требований приложения.
Самый простой способ закрыть окно в PyQt5 — это использовать метод close(). Он вызывается на объекте окна и закрывает его. Пример кода:
window.close()
Другой способ закрыть окно заключается в отправке сигнала «закрытие окна». Сигнал обрабатывается методом, который может выполнить дополнительный код перед закрытием окна. Пример кода:
window.closeEvent = self.closeEvent
def closeEvent(self, event):
# Дополнительный код
super().closeEvent(event)
Третий способ закрыть окно через приложение QApplication. В этом случае используется метод quit(), который закрывает все окна и завершает приложение. Пример кода:
from PyQt5.QtWidgets import QApplication, QMainWindow
app = QApplication([])
main_window = QMainWindow()
main_window.show()
app.exec_()
# Закрыть все окна и выйти из приложения
app.quit()
Описанные выше способы закрытия окна являются наиболее распространенными в PyQt5. Выбор способа зависит от требований вашего приложения.
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