How to convert nested list of lists into a list of tuples in python 3.3?

Question

I am trying to convert a nested list of lists into a list of tuples in Python 3.3. However, it seems that I don't have the logic to do that.

The input looks as below:

>>> nested_lst = [['tom', 'cat'], ['jerry', 'mouse'], ['spark', 'dog']]

And the desired ouptput should look as exactly as follows:

nested_lst_of_tuples = [('tom', 'cat'), ('jerry', 'mouse'), ('spark', 'dog')]

Redeploy

Answer 1

Just use a list comprehension:

nested_lst_of_tuples = [tuple(l) for l in nested_lst]

Demo:

>>> nested_lst = [['tom', 'cat'], ['jerry', 'mouse'], ['spark', 'dog']]
>>> [tuple(l) for l in nested_lst]
[('tom', 'cat'), ('jerry', 'mouse'), ('spark', 'dog')]

Argol

What if the level of nesting for each item is unknown? Well, Mr. Pieters already answered this here :) – Condillac

Answer 2

You can use map():

>>> list(map(tuple, [['tom', 'cat'], ['jerry', 'mouse'], ['spark', 'dog']]))
[('tom', 'cat'), ('jerry', 'mouse'), ('spark', 'dog')]

This is equivalent to a list comprehension, except that map returns a generator instead of a list.

Engagement

Answer 3

[tuple(l) for l in nested_lst]

Thibodeaux

Answer 4

I used list comprehension as a solution , below is my style

nested_lst = [['tom', 'cat'], ['jerry', 'mouse'], ['spark', 'dog']]

nested_new_list =[(i,j) for i,j in nested_lst]

print(nested_new_list)

output : [('tom', 'cat'), ('jerry', 'mouse'), ('spark', 'dog')]

Rocketry