python sort key
>>> a=range(10)>>> b=a[::-1]
>>> a
>>> b
>>> c=zip(a,b)
>>> c
[(0, 9), (1,8), (2, 7), (3, 6), (4, 5), (5, 4), (6, 3), (7, 2), (8, 1), (9, 0)]
>>> c.sort(key=lambda x:x)
>>> c
[(0, 9), (1,8), (2, 7), (3, 6), (4, 5), (5, 4), (6, 3), (7, 2), (8, 1), (9, 0)]
>>> c.sort(key=lambda x:x)
>>> c
[(9, 0), (8, 1), (7, 2), (6, 3), (5, 4), (4, 5), (3, 6), (2, 7), (1,8), (0, 9)]
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