Get the code: learnpyqt.py
Qt is a widely-known framework for developing cross-platform software that can be run on various software and hardware platforms with little or no change in the code, while having the power and speed of native applications. Though Qt was originally written in C++.
This is an adaption on the C++ intro to QT by Aleksey Kholovchuk, some of the code examples should result in the same functionality this version just having been done using pyqt!
import sys
from PyQt4 import QtGui
def window():
# Create an application object
app = QtGui.QApplication(sys.argv)
# Create a widget where our label will be placed in
w = QtGui.QWidget()
# Add a label to the widget
b = QtGui.QLabel(w)
# Set some text for the label
b.setText("Hello World!")
# Give some size and placement information
w.setGeometry(100, 100, 200, 50)
b.move(50, 20)
# Give our window a nice title
w.setWindowTitle("PyQt")
# Have everything display
w.show()
# Execute what we have asked for, once all setup
sys.exit(app.exec_())
if __name__ == '__main__':
window()
In order to get some of the more advanced features in pyqt we need to start looking at building additional elements. Here we show how to introduce a dialog popup box, useful for asking the user to confirm a decision or to provide information.
import sys
from PyQt4.QtGui import *
from PyQt4.QtCore import *
def window():
app = QApplication(sys.argv)
w = QWidget()
# Create a button and attach to widget w
b = QPushButton(w)
b.setText("Press me")
b.move(50, 50)
# Tell b to call this function when clicked
# notice the lack of "()" on the function call
b.clicked.connect(showdialog)
w.setWindowTitle("PyQt Dialog")
w.show()
sys.exit(app.exec_())
# This function should create a dialog window with a button
# that waits to be clicked and then exits the program
def showdialog():
d = QDialog()
b1 = QPushButton("ok", d)
b1.move(50, 50)
d.setWindowTitle("Dialog")
# This modality tells the popup to block the parent whilst it's active
d.setWindowModality(Qt.ApplicationModal)
# On click I'd like the entire process to end
b1.clicked.connect(sys.exit)
d.exec_()
if __name__ == '__main__':
window()
Got a suggestion? A correction, perhaps? Open an Issue on the GitHub Repo, or make a pull request yourself!
Originally contributed by Nathan Hughes, and updated by 3 contributors.