Find the min, max value in a list of tuples

by 
map(max, zip(*alist))

This first unzips your list, then finds the max for each tuple position

>>> alist = [(1,3),(2,5),(2,4),(7,5)]
>>> zip(*alist)
[(1, 2, 2, 7), (3, 5, 4, 5)]
>>> map(max, zip(*alist))
[7, 5]
>>> map(min, zip(*alist))
[1, 3]

This will also work for tuples of any length in a list.

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