1. PyKDE Tutorial Jonathan Riddell Ubuntu, KDE, Canonical
March 2011 | Bengaluru, India | conf.kde.in

2. Jonathan Riddell, Canonical
Python, Qt, Kubuntu
Python
Programming Language, Popular, not compiled, dynamic typing, easy, used by Ubuntu Qt
GUI programming library, used by KDE, easy to learn, well documented, cross platform
Kubuntu
Awesome KDE based Linux distro from Ubuntu
Conf.kde.in 2011
Jonathan Riddell, Canonical

3. First Python Application
#!/usr/bin/python
# coding: UTF-8
print "ಹಲೊ"
Save to 1-hello.py
python 1-hello.py Or
chmod hello.py
./1-hello.py
Conf.kde.in 2011
Jonathan Riddell, Canonical

4. Jonathan Riddell, Canonical
PyQt Application
import sys
from PyQt4.QtCore import *
from PyQt4.QtGui import *
from PyQt4.QtWebKit import *
app = QApplication(sys.argv)
web = QWebView()
web.load(QUrl("
web.show()
sys.exit(app.exec_())
Conf.kde.in 2011
Jonathan Riddell, Canonical

5. Jonathan Riddell, Canonical
PyKDE Application
from PyKDE4.kdecore import *
from PyKDE4.kdeui import *
appName = "python-kde-tutorial"
catalog = ""
programName = ki18n("PyKDE Tutorial")
version = "1.0"
description = ki18n("A Small Qt WebKit Example")
license = KAboutData.License_GPL
copyright = ki18n("(c) 2008 Canonical Ltd")
text = ki18n("none")
homePage = "
bug = ""
aboutData = KAboutData (appName, catalog, programName, version, description,
license, copyright, text, homePage, bug )
KCmdLineArgs.init(sys.argv, aboutData)
app = KApplication()
Conf.kde.in 2011
Jonathan Riddell, Canonical

6. PyKDE Object Orientated
Add this after the import lines:
class Tutorial(object):
def __init__(self):
self.web = QWebView()
self.web.load(QUrl("
self.web.show()
Remove the QWebView lines after creating the KApplication add this:
app = KApplication()
tutorial = Tutorial()
Conf.kde.in 2011
Jonathan Riddell, Canonical

7. Jonathan Riddell, Canonical
Use a Layout
Replace the __init__ method with:
self.widget = QWidget()
layout = QVBoxLayout(self.widget)
self.web = QWebView(self.widget)
self.web.load(QUrl("
layout.addWidget(self.web)
self.widget.show()
Conf.kde.in 2011
Jonathan Riddell, Canonical

8. Jonathan Riddell, Canonical
Use a KMainWindow
At top of the __init__ method:
self.window = KMainWindow()
self.widget = QWidget()
self.window.setCentralWidget(self.widget)
Instead of showing the widget
self.window.show()
Conf.kde.in 2011
Jonathan Riddell, Canonical

9. Jonathan Riddell, Canonical
Add the address bar
Now we can add our address bar.
After creating the layout add:
self.addressBar = QLineEdit(self.widget)
layout.addWidget(self.addressBar)
Conf.kde.in 2011
Jonathan Riddell, Canonical

10. Jonathan Riddell, Canonical
Use a Layout
Below self.window.show() add this connect line and the following method:
QObject.connect(self.addressBar, SIGNAL("returnPressed()"), self.loadUrl)
def loadUrl(self):
print "Loading " + self.addressBar.text()
self.web.load( QUrl(self.addressBar.text()) )
Conf.kde.in 2011
Jonathan Riddell, Canonical