Possible Duplicate:
A Transpose/Unzip Function in Python
I’ve used the zip() function from the numpy library to sort tuples and now I have a list containing all the tuples. I had since modified that list and now I would like to restore the tuples so I can use my data. How can I do this?
Answers:
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Method 1
lst1, lst2 = zip(*zipped_list)
should give you the unzipped list.
*zipped_list unpacks the zipped_list object. it then passes all the tuples from the zipped_list object to zip, which just packs them back up as they were when you passed them in.
so if:
a = [1,2,3] b = [4,5,6]
then zipped_list = zip(a,b) gives you:
[(1,4), (2,5), (3,6)]
and *zipped_list gives you back
(1,4), (2,5), (3,6)
zipping that with zip(*zipped_list) gives you back the two collections:
[(1, 2, 3), (4, 5, 6)]
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