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')]
Asked By: Mohammed

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Source

Answers:

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')]
Answered By: Martijn Pieters
[tuple(l) for l in nested_lst]
Answered By: Ajit George

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.

Answered By: TerryA

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')]
Answered By: ranga abi