Frits van Bommel: > To allow two expressions separated by a comma to be another expression. This > is > only useful if the expression before the last comma has side-effects of > course, > since its value isn't used. Such an expression returns the result of its > right-hand side. > For example: (foo(), bar()) is an expression that calls foo(), then calls > bar() > and evaluates to the return value of bar(). > This is mostly used in the increment clause of a for loop, like this:
Outside for loops is a bug-prone and not much useful feature. (In python the comma is more useful and safer). Bye, bearophile
