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print 'y =', y ... 'exceptions.Exception'> ('spam', 'eggs') ('spam', 'eggs') x = spam y = eggs If an exception has an argument, it is printed as the last part (‘detail') More information on classes is presented in chapter Classes. 8.6. Here the function returns an integer, so x and y are optional integers. For convenience, the exception instance defines __str__() so the arguments can be printed directly without having to reference .args.

These statements execute regardless of whether or not an exception was thrown or caught. For example, loading an NSString from disk looked like this in Swift 1.2: var err: NSError? set.seed(123) x <- stats::rnorm(50) doit <- function(x) { x <- sample(x, replace = TRUE) if(length(unique(x)) > 30) mean(x) else stop("too few unique points") } ## alternative 1 res <- lapply(1:100, function(i) For example, the following code uses several approaches to fetch data, or returns nil if all of the approaches fail. func fetchData() -> Data