How can I convert this tuple to a list

Question

I have the following tuple (list_permutation):

[(1,), (2,), (3,), (1, 2), (1, 3), (2, 1), (2, 3), (3, 1), (3, 2)]

And I want to convert it in a list that looks like:

[[1],[2],[3],[1,2],[1,3]]...

This is my code that I've already tried:

result = [int(x) for x, in list_permutation]
print(result)

But I'm getting this error:

---------------------------------------------------------------------------
ValueError                                Traceback (most recent call last)
<ipython-input-63-fc7f88d67875> in <module>
----> 1 result = [int(x) for x, in list_permutation]
      2 print(result)

<ipython-input-63-fc7f88d67875> in <listcomp>(.0)
----> 1 result = [int(x) for x, in list_permutation]
      2 print(result)

ValueError: too many values to unpack (expected 1)

@Marek do you have a typo? Same as the answer below and works fine: https://repl.it/repls/VagueHighlevelBrains — Error - Syntactical Remorse, Apr 12 '19 at 16:28
@Marek - did you use `list` as a variable name somewhere? If so, you've reassigned the built-in `list` constructor - don't do that. You can get at the builtin in that situation with the `__builtins__` module, but it's a better practice not to use variable names that shadow the builtins. — Peter DeGlopper, Apr 12 '19 at 16:29
in your link it works. But I use jupyter notebook and there the code doesn´t work — Marek, Apr 12 '19 at 16:32

Filip Dimitrovski · Accepted Answer · 2019-04-12T16:38:55.813

4

l = [(1,), (2,), (3,), (1, 2), (1, 3), (2, 1), (2, 3), (3, 1), (3, 2)]
new_l = [list(x) for x in l]
print(new_l)

This yields [[1], [2], [3], [1, 2], [1, 3], [2, 1], [2, 3], [3, 1], [3, 2]].

edited Apr 12 '19 at 16:38

answered Apr 12 '19 at 16:25

Filip Dimitrovski

1,576
11
15

I get an error: list object not callable – Marek Apr 12 '19 at 16:28
Looks like you've defined something as list. Try restarting @Marek – yatu Apr 12 '19 at 16:32
@Marek check my solution – kumar Apr 12 '19 at 16:33
@Marek The reason is that you have redefined `list` somewhere. If you have some variable, function, module or class named `list`, rename it to something else like `mylist`. – Filip Dimitrovski Apr 12 '19 at 16:37

score 0 · Answer 2 · answered Apr 12 '19 at 16:30

0

You can use the in built map function:

l = [(1,), (2,), (3,), (1, 2), (1, 3), (2, 1), (2, 3), (3, 1), (3, 2)]
l = list(map(list, l))
print(l)

This should give you [[1], [2], [3], [1, 2], [1, 3], [2, 1], [2, 3], [3, 1], [3, 2]]

answered Apr 12 '19 at 16:30

yeshks

101
6

`map` is outdated, except for some special cases. Though it has its uses, it is less readable than list comprehension and as such less favored. – Error - Syntactical Remorse Apr 12 '19 at 16:32

score 0 · Answer 3 · answered Apr 12 '19 at 16:32

Using map this can be achieved easily

perm = [(1,), (2,), (3,), (1, 2), (1, 3), (2, 1), (2, 3), (3, 1), (3, 2)]
perm_as_list = map(list, perm)

Output below

In [1]: perm = [(1,), (2,), (3,), (1, 2), (1, 3), (2, 1), (2, 3), (3, 1), (3, 2)]
In [2]: perm_as_list = map(list, perm)
In [3]: perm_as_list
Out[3]: [[1], [2], [3], [1, 2], [1, 3], [2, 1], [2, 3], [3, 1], [3, 2]]

score 0 · Answer 4 · answered Apr 12 '19 at 16:38

0

list function can convert a tuple to list you have a list of tuples so do the folowing:

list_permutation=[(1,), (2,), (3,), (1, 2), (1, 3), (2, 1), (2, 3), (3, 1), (3, 2)]
result = [list(x) for x in list_permutation]

answered Apr 12 '19 at 16:38

neferjina

31
1
6

How can I convert this tuple to a list

4 Answers4