Theindex is the part within square brackets. So for list[i], your index is i.Python is telling you that the index must be an int or a slice, not a list. In the for i in list: line, the variable i isn't set to the place in the list, it's set to each element in turn. So I suspect you were intending something closer to: FrankHerbert Quotes. I must not fear. Fear is the mind-killer. Fear is the little-death that brings total obliteration. I will face my fear. I will permit it to pass over me and through me. And when it has gone past, I will turn the inner eye to see its path. Where the fear has gone, there will be nothing. Only I will remain. a That's already covered in the other answer. b) That's not a bug. That's by (good) design. If a property may hold a null besides a defined type, you want to be explicit about it. I would expect such a report to be declined out of hand. Whatis the force of gesehen haben muss : You [one has] gotta see, You ought to have seen, or you must already have seen? Can I duplicat (get a copy) of a 0.5 morph curve into a simple bezier curve? Why should I seek to determine the ultimate nature of reality (i.e. whether God exists or not)? Whenyou hear of wars and rebellions, do not be alarmed. These things must happen first, but the end is not imminent." New American Bible When you hear of wars and insurrections, do not be terrified; for such things must happen first, but it will not immediately be the end." NET Bible And when you hear of wars and rebellions, do not be afraid. mustnot be abstract. The model-binding system is going to want to be able to create instances of the class, so it cannot be abstract; it must be concrete. All of the types you've show are concrete so this isn't the problem. or value types. You can't use struct types with model-binding; it's just one of its limitations. Fortunately your types Asa first step, we'll need to create some data that we can use in the examples later on: data <- data.frame( x = LETTERS [1:5], # Create example data y = 1:5) data # Print example data # x y # 1 A 1 # 2 B 2 # 3 C 3 # 4 D 4 # 5 E 5. In case we want to draw our data with the ggplot2 package, we also have to install and load ggplot2 to R: Aw1emq.

must be not or must not be