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python PyQt4 study notes 01

PyQt API is GUI widgets toolkit in python. QtCore module contains non-GUI function and QtGui contains the graphical controls.

QWidget class is derived from QObject and QPaintDevice classes. it is the base class for user interface objects.

QMainWindow is derived from QWidget. Most GUI window is created by QMainWindow.

A first example of PyQt to show the basic structure:

import sys
from PyQt4 import QtGui, QtCore

class myApp(QtGui.QWidget):

    def __init__(self):
        super(myApp, self).__init__()
        self.setGeometry(100, 100, 800, 600)
        self.setWindowTitle("PyQt example")


    def home(self):
        #1 add a button
        #1.1 button has clicked signal and connect to a slot function
        self.btn1 = QtGui.QPushButton("Quit", self)
        self.btn1.move(100, 100)

        self.btn2 = QtGui.QPushButton("Print Test", self)
        self.btn2.move(200, 100)        

        self.label = QtGui.QLabel(self)
        self.label.setText("This is old label")
        self.label.move(200, 50)

    def print_test(self):
        self.label.setText("Button clicked!")

def main():
    app = QtGui.QApplication(sys.argv)
    gui = myApp()

if __name__ == '__main__':

A good way to organize the code is following Eli Bendersky first example and Eli Bendersky second example

Reference 1. 2.