I like Python's syntax, I enjoy how easy it can be to get up and running with something real. I also like that Ubuntu comes with it, but everything else is crappy. I don't like the package system, pip is not that great and needs work. The almost cult like refusal to upgrade to 3.x weakens the community resulting in less available modules. It's also not a very strong contender for web development.

Not as strong as other languages perhaps, but Django & co. are more than capable of turning out nice web stuff.

Slightly OT.

As much as I love Python, in this case a '1-liner' using awk and sort or sed, tr, dd etc. would get you there 'faster'.

awk '{print tolower($0)}' domains.txt > whitelist.txt && cat whitelist.txt | sort -o whitelist.txt

That's probably just because the example is kept simple to illustrate Python's terseness, readability, productivity etc.

Totally agree with you; however, I think it showcases that maybe Javascript is now Python's biggest competitor. It is more on the productivity and expressiveness level of Python but now works in a greater number of places than Python. Sure it is not as elegant, but it is improving a lot faster than before.