How to implement a simple button in PyQt

Question

I want to implement a simple button in PyQt which prints "Hello world" when clicked. How can I do that?

I am a real newbie in PyQt.

Solution

If you're new to PyQt, there are some useful tutorials on the PyQt Wiki to get you started. But in the meantime, here's your "Hello World" example:

from PyQt5 import QtWidgets, QtCore

class Window(QtWidgets.QWidget):
    def __init__(self):
        super().__init__()
        self.button = QtWidgets.QPushButton('Test')
        self.button.clicked.connect(self.handleButton)
        layout = QtWidgets.QVBoxLayout(self)
        layout.addWidget(self.button)

    def handleButton(self):
        print('Hello World')

if __name__ == '__main__':

    import sys
    app = QtWidgets.QApplication(sys.argv)
    window = Window()
    window.show()
    sys.exit(app.exec_())

Comments

[Amelio Vazquez-Reina]

When I try this I get: Failed to load platform plugin "xcb". Available platforms are "linuxfb" and "minimal". Do you know why? I am running from with the latest stable Python, IPython, Qt5 and snapshot from PyQt4

[ekhumoro]

@user815423426. Sounds like your installation is broken. What platform are you on, and how did you install the components?