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My wife used to work as an accountant in a company that used an accounting system produced by a software factory named after a wizard. They paid a lot of money for hotline support. After a few years of observing them, I realized that the hotline had only one piece of advice to give its users: Okay, that is a bug. You can work around it like this. However, it s better to wait for a new update; then it will be fixed. That is advice perfectly in keeping with their wizard name: Wait, I am preparing a magical update! I believe there were at least three updates while I was watching and as far as I can tell, they always fixed something, but simultaneously caused a number of regressions. My wife told me that she needed to spend hours on the hotline to learn how to perform various SQL selects and updates to fix the databases to work with the updated versions.

Figure 2-4. A Django server error page This page looks a little scary, but it s actually not. Once again, Django s debugging mode is trying to give you as much information as it can. The top of the page shows a short summary of the error, followed by more detailed information, including a full stack trace (a copy of everything Python and Django were doing when the error happened), a listing of the incoming HTTP request, and your Django project s settings (with any sensitive settings, such as database passwords, blanked out for security reasons). The problem here is that a flat page, like most output from Django, expects to be displayed using a template that will generate the correct HTML. django.contrib.flatpages, by default, looks for a template file named flatpages/default.html, and you haven t created that yet. The editing form in the admin interface will, if you go back and look for it, also show a field where you can input a different template file name on a per-page basis. So let s pause for a moment and take care of that.

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Figure 16-11. An optically isolated digital input It s also possible to isolate analog signals, but this is a more complex topic. As a starting point, if you re looking to isolate an AC signal consider a small transformer and some filtering circuitry. To deal with an AC or DC signal, dig into purpose-built analog isolation using devices like Isolation Amplifiers Burr Brown ISO100 being the start of a long line of these specialist devices.

Software projects tend to walk simultaneously in many vicious circles. The amoeba model is an accepted reality. If there is a huge outstanding problem, it can always be fixed. You simply have to accept the collateral damage caused by regressions all around. That is why people are generally afraid of updates. Most of our experience tells us that it s better to live with something that is sort of working than to risk an update to a new version, with unknown behavior: Oops, just don t touch that part of the application!

Note We can apply the principle of this optocoupler-based isolation circuit to provide a mains synchronised 50Hz/60Hz reference signal. Figure 16-12 shows the general approach: 12 VAC is provided from a plugpack/wall wart to power the LED in the optocoupler. The external diode means that the optocoupler only sees voltage for one half of the mains cycle and so the transistor will be turned on at 50 or 60Hz depending on the local mains frequency. The external diode is preferred to relying on the LEDs own diode action because it ensures the reverse voltage on the optocoupler isn t exceeded. The plugpack can, of course, be used to power the rest of the circuitry through a suitable bridge rectifier, filter, and regulator.

All users running Linux on their own notebooks, two years before or after 2006, know the following feeling: Okay, I have a sort of working system. It works. It can hibernate and most of the time it can also awake from hibernation. It doesn t suspend, but that is probably acceptable. Should I risk an update to a new version of X server with the hope that suspend starts to work as well, while risking that I ll lose the ability to hibernate

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