Which is all very well (and for something simple like str.endswith might well be enough), but for many things, even a professional Python programmer might eithe

Which is all very well (and for something simple like str.endswith might well be enough), but for many things, even a professional Python programmer might either a) not remember the exact name of the method or other thing they're looking up, or b) want a more detailed explanation or examples showing usage. None of that is going to be given either in an IDE or from help().