Python docs are mostly "reference" material. Which means it's not intended to show you how things are done, but used as detailed descriptions of commands/statements/classes/methods.
This is why you are having trouble understanding it. You first need to go understand fundamentals of it and they will be useful when you need details and intricacies of something while using it.
" 40 LRVs purchased in 2002" don't you think they are still pretty new?