Hi All I am reading this http://www.ibiblio.org/obp/thinkCSpy/chap09.htm and did not understood the Section 9.3 at all, Please explain me with an example so the idea become clear and understood
#################################################################### 9.3 Tuples as return values Functions can return tuples as return values. For example, we could write a function that swaps two parameters: def swap(x, y): return y, x Then we can assign the return value to a tuple with two variables: a, b = swap(a, b) In this case, there is no great advantage in making swap a function. In fact, there is a danger in trying to encapsulate swap, which is the following tempting mistake: def swap(x, y): # incorrect version x, y = y, x If we call this function like this: swap(a, b) then a and x are aliases for the same value. Changing xinside swap makes x refer to a different value, but it has no effect on a in __main__. Similarly, changing y has no effect on b. This function runs without producing an error message, but it doesn't do what we intended. This is an example of a semantic error. As an exercise, draw a state diagram for this function so that you can see why it doesn't work. #################################################################### Thanks in Advance Regards Kaushal _______________________________________________ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
