how to convert the brackets of a list from [] to()

Question

I have a list in this format:

a =[["1","2"], ["3","4"]]

I need to turn it into this format:

a =[("1","2"), ("3","4")]

thank you

They are two different object types. [lists](https://docs.python.org/2/tutorial/datastructures.html#more-on-lists) are denoted by `[...]` and [tuples](https://docs.python.org/2/tutorial/datastructures.html#tuples-and-sequences) are denoted by `(...)`. It is not that they have different brackets, they are entirely different data structures. For one thing, tuples are immutable while lists can be changed. — Farmer Joe, Dec 04 '14 at 17:19

score 3 · Accepted Answer · answered Dec 04 '14 at 17:15

3

use tuple and list comprehension :

>>> a=[tuple(i) for i in a]
>>> a
[('1', '2'), ('3', '4')]

Also you can use map function (less performance than list-comprehension):

>>> a=map(tuple,a)
>>> a
[('1', '2'), ('3', '4')]

answered Dec 04 '14 at 17:15

Mazdak

score 2 · Answer 2 · answered Dec 04 '14 at 17:17

2

Another solution, you can use map

>>> a =[["1","2"], ["3","4"]]
>>> map(tuple, a)
[('1', '2'), ('3', '4')]

answered Dec 04 '14 at 17:17

Adem Öztaş

2 Answers2