如何制作一个返回元组列表的函数，该列表按元组中的最后一个元素排序？

Question

This is the code I am trying to run but it doesn't work. It says invalid syntax.

    def sort_last(tuples):
        return sorted(tuples, key = tuples[-1]


    x = [(7, 6), (5, 5), (2, 1)]
    print sort_last(x)

Answer 1

Use a lambda:

def sort_last(tuples):
    return sorted(tuples, key = lambda t: t[-1])