Code is always printed in a monospaced font - like this:
class Test:
def printTest(self):
print self
This also holds for references to bits of code in the running text. If I cite a function in the text, it is done like this: printTest() — i.e., I generally don't quote the parameter list. This makes it easier to follow the run of the text
Even though PyQt is a cross-platform toolkit (and I've tested most of the examples on Windows, too), all development has been done on two Linux computers: my laptop ‘maldar', and my main system, ‘calcifer', named after one of the main characters in Diana Wynne Jones' Howl's Moving Castle. Because BlackAdder wasn't ready when I wrote this book, I used XEmacs and Bash (the command line shell) to create and test all examples. That's why you will often see prompts in illustrations, and not so often screenshots of BlackAdder:
boudewijn@maldar:~/doc/pyqt/ch3 > python sigslot.py
Object with ID 135113236 Got signal: message
Object with ID 135115668 Got signal: message
Object with ID 135318532 Got signal: message
boudewijn@maldar:~/doc/pyqt/ch3 >
If you are using Windows, you can use a DOS box to emulate the Bash shell, but it won't be quite as convenient.
Finally, it is a widely-honored convention in programming literature, and especially in Python books, to make allusions and puns that are related to the punny names of the product. By rights I should have filled my code with witty allusions to the British comedy series Monty Python and BlackAdder. However, excellent and essential as these are, it's been long years since I last watched those on the television, and I don't feel quite up to it. I've done my best, but don't expect too much!
A note on versions: when I wrote this book I mostly used the stable 2.x versions of Qt, but as soon as betas of Qt 3.x became available, I started integrating information about its improvements in the text. I will note wherever one version is different from the other. On the Opendocs webforum for this book you'll find versions of the examples both for Qt 2.x and Qt 3.x.