Python iterators considered harmful

I just tracked down a nasty bug in my code to a gotcha with Python iterators.

Consider the following code...

Python property gotcha

If you like using a single getter/setter function for your properties, watch out if using None for the default. If you do that you won't be able to set your property to None!

Example code and workaround...

Prevent double click on form submission

Recently I've been going over the Hub logs and fixing issues which have caused exceptions to be raised in the application.

One in particular had me stumped for a while. An exception was being raised in an attempt to unregister a server from the Hub, but the server did not exist in the database - in theory this is impossible and should never happen.

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