CODEWITHSUNDEEP
pythonlistmultidimensional-array
BlackHawk
BlackHawk

Reputation: 37

How to combine 2d lists elements in python - Taking order in consideration

I have a script in Python which will parse some values from a file and will store it in a 2d lists like the below:

[['x'], ['Y'], ['Z']]

[['99'], ['88'], ['77']]

[['host1'], ['host2'], ['host3']]

[['a', 'b', 'c','d','e'], ['f, 'g', 'h','i','j'], ['k', 'l', 'm','n','o']]

All I want to achieve is to combine these lists in one large list using the following order 

[[['X'],['99'],['host1'], ['a','b','c','d','e']], [['Y'], ['88'], ['host2'], ['f','g','h','i',j]]] etc ..

I have searched stackoverflow for such question and I couldn't find any.

Any help will be greatly appreciated.

Thanks

Upvotes: 0

Views: 53

Answers (2)

Pynchia
Pynchia

Reputation: 11590

As already mentioned in the excellent answer you got, use zip.

a=[['x'], ['Y'], ['Z']]
b=[['99'], ['88'], ['77']]
c=[['host1'], ['host2'], ['host3']]
d=[['a', 'b', 'c','d','e'], ['f', 'g', 'h','i','j'], ['k', 'l', 'm','n','o']]

z=[list(el) for el in zip(a,b,c,d)]
print z

produces

[[['x'], ['99'], ['host1'], ['a', 'b', 'c', 'd', 'e']], [['Y'], ['88'], ['host2'], ['f', 'g', 'h', 'i', 'j']], [['Z'], ['77'], ['host3'], ['k', 'l', 'm', 'n', 'o']]]

which is a list of lists, not of tuples (as indicated in the question).

There is no practical difference if all you need to do on the elements is to iterate over them and read from them. On the other hand, in case you need to alter the elements and change them 'in-place', lists allow you to do that (they are mutable), whereas tuples do not.

Upvotes: 0

John1024
John1024

Reputation: 113864

Let's define your lists:

>>> a = [['x'], ['Y'], ['Z']]
>>> b = [['99'], ['88'], ['77']]
>>> c = [['host1'], ['host2'], ['host3']]
>>> d = [['a', 'b', 'c','d','e'], ['f', 'g', 'h','i','j'], ['k', 'l', 'm','n','o']]

I believe that this does what you want:

>>> zip(a, b, c, d)
[(['x'], ['99'], ['host1'], ['a', 'b', 'c', 'd', 'e']), (['Y'], ['88'], ['host2'], ['f', 'g', 'h', 'i', 'j']), (['Z'], ['77'], ['host3'], ['k', 'l', 'm', 'n', 'o'])]

Upvotes: 3

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