How to separate a tuple with 2 parts into separate lists?

Question

So I have a tuple that has two lists in it:

x = (['a', 's', 'd'], ['1', '2', '3'])

How do I make it into two lists? Right now my code basically looks like:

list1.append(x[1])
list1.append(x[2])
list1.append(x[3])

But I can't add the other 3 items into a separate list with indexes 4, 5 and 6:

list2.append(x[4])
list2.append(x[5])      -results in an error
list2.append(x[6])

How can I do the above to make a list2?

`list1, list2 = x`? Note that Python indices are **zero-based**, by the way. — jonrsharpe, Oct 22 '15 at 12:42
`list1.append(x[2])` will already throw an error, because `x` only has indices `0` and `1`. — Martijn Pieters, Oct 22 '15 at 12:42
@kasramvd: How are this question and that dupe target related? — Martijn Pieters, Oct 22 '15 at 12:45
It's very clear. In both questions OP wants to assign the items of an iterable to separate variables. I'm wonder that why you reopened the question. I'm sure that it's not because of your answer to question but I would be appreciate if you tell the the reason. — Mazdak, Oct 22 '15 at 12:51
@Kasramvd: but the tldr version is: this question is not about assigning dynamically. — Martijn Pieters, Oct 22 '15 at 12:56

score 2 · Answer 1 · edited May 23 '17 at 12:14

2

Your tuple has only two elements. Just reference those directly:

list1 = x[0]
list2 = x[1]

or

list1, list2 = x

This creates additional references to the two lists contained in x, not copies. If you need new list objects with the same contents, create copies:

list1, list2 = x[0][:], x[1][:]

See How to clone or copy a list?

edited May 23 '17 at 12:14

Community

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answered Oct 22 '15 at 12:41

Martijn Pieters

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Thanks! I'm still new at this so I automatically tried appending with indexes 1, 2 and 3, which gave me the correct answer for list1, but didn't work for list2 – S. Martin Oct 22 '15 at 12:49
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@S.Martin: but you don't *have* and index `2` in your tuple, as defined in the question. If those indices worked, then `x` is a different object and you asked the wrong question. – Martijn Pieters Oct 22 '15 at 12:51

How to separate a tuple with 2 parts into separate lists?

1 Answers1