Strictly speaking, a function can only return one value, but if the value is a tuple, the effect is the same as returning multiple values. For example, if you want to divide two integers and compute the quotient and remainder, it is inefficient to compute x/y and then x%y. It is better to compute them both at the same time. The built-in function divmod takes two arguments and returns a tuple of two values, the quotient and remainder. You can store the result as a tuple:
Here is an example of a function that returns a tuple:
max and min are built-in functions that find the largest and smallest elements of a sequence. max_min computes both and return a tuple of two values.
from Thinking in Python
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原文：http://www.cnblogs.com/ryansunyu/p/3855002.html