What makes Python stand out for use in web development?  What are some examples of highly successful uses of Python on the web?
Dynamic languages are in general good for web apps because the speed of development. Python in particular has two advantages over most of them:

"batteries included" means lots of available libraries
Django. For me this is the only reason why i use Python instead of Lua (which i like a lot more).
What are the benefits of using Python for web programming?