Problem involving sets...

[Felipe Almeida Lessa]

Em Sex, 2006-04-14 às 15:43 -0700, flamesrock escreveu:
> Does anyone have a simple solution????

$ python2.4
Python 2.4.3 (#2, Mar 30 2006, 21:52:26)
[GCC 4.0.3 (Debian 4.0.3-1)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> l1 = [['c1',1],['c2',2],['c3',4]]
>>> l2 = [['c1',1],['c2',2],['c4',4],['c3',3]]
>>> print [tuple(x) for x in l1]
[('c1', 1), ('c2', 2), ('c3', 4)]
>>> print [tuple(x) for x in l2]
[('c1', 1), ('c2', 2), ('c4', 4), ('c3', 3)]
>>> s1 = frozenset(tuple(x) for x in l1)
>>> s2 = frozenset(tuple(x) for x in l2)
>>> print s1
frozenset([('c2', 2), ('c1', 1), ('c3', 4)])
>>> print s2
frozenset([('c2', 2), ('c4', 4), ('c3', 3), ('c1', 1)])
>>> print s2-s1
frozenset([('c4', 4), ('c3', 3)])
>>> print [list(x) for x in s2-s1]
[['c4', 4], ['c3', 3]]


-- 
Felipe.