Why I wound up using Django
Eevee just wrote (and I just read) a good article on Python web development. It was an interesting experience for me, because a great deal of the article is about a middle level in Python webdev that I've basically skipped right over. I've worked at the level of CGI and WSGI and I've worked in the big framework land of Django, but I've never played around in the world of relatively simple and component-ized Python web frameworks that Eevee mostly talks about (to the extent that I merged them in with Django when I wrote about modern Python web app options). And that raises an obvious question: why did I wind up using Django instead of one of the smaller and simpler alternatives?
While I could say various things, the honest answer is twofold: good PR on Django's part and 'batteries included', with the first one being more important. The good PR insured that I knew of Django and indeed thought of it as the natural choice once I knew that I needed a framework. The batteries included nature meant that I was getting everything I needed in one place, pre-integrated for me, with no omissions that might have pulled me out to look at anything else.
Do I feel bad about falling for Django's PR and batteries included monolith? No. Not at all. While I have some sympathies to the smaller and leaner frameworks (I'm ordinarily a smaller is better person), I feel that frameworks are special in a way. The thing about frameworks is that they are only a means to an end, ie a working web app. Almost all web apps are small and undemanding enough that the differences between good enough frameworks are not important; any one of them will do. What really matters is getting your application written, and for that the inclusion of batteries matters a lot.
Let me be blunt. For most people selecting a framework, the last thing they want to do is then try to pick out a templating system, a database ORM layer, a forms handling package, and so on. This is especially so because all of those things are what really gets the work done for most projects; without them, a framework is only a skeleton that does, well, not very much (it's less a framework and more a request/response handling library) and provides very little help for your project. This means that including batteries by default is quite important in practice (even if it may cause political difficulties). I don't think that you have to make the default choice the only option, but if you want me to pay your framework much attention you need something that's pre-chosen and ideally pre-assembled for me; doing otherwise means that your framework simply requires too much additional time when there are other options.
Even if Django had not had the PR edge that it does, even if it had simply been one among a number of equally well known contenders, I think I would have chosen it purely for the batteries included nature. I had a project to get done and Django offered me a single solution for everything I needed so I could immediately jump into building my actual app.