duplicate items in a list
Daniel Schüle
uval at rz.uni-karlsruhe.de
Mon Nov 21 06:51:01 EST 2005
Shi Mu wrote:
> I used the following method to remove duplicate items in a list and
> got confused by the error.
>
>
>>>>a
>
> [[1, 2], [1, 2], [2, 3]]
>
>>>>noDups=[ u for u in a if u not in locals()['_[1]'] ]
>
> Traceback (most recent call last):
> File "<interactive input>", line 1, in ?
> TypeError: iterable argument required
>>> a
[[1, 2], [1, 2], [2, 3]]
>>> c=[]
>>> for x in a:
... if x not in c: c.append(x)
...
>>> c
[[1, 2], [2, 3]]
or (Python 2.4)
>>> a
[[1, 2], [1, 2], [2, 3]]
>>> set([frozenset(u) for u in a])
set([frozenset([1, 2]), frozenset([2, 3])])
hth Daniel
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