Python list of tuples: increase number of tuple members

Question

I have a list of tuples with the pattern "id", "text", "language" like this:

a = [('1', 'hello', 'en'), ...]

I would like to increase number of tuple members to "id", "text", "language", "color":

b = [('1', 'hello', 'en', 'red'), ...]

What is the correct way of doing this?

Thank you.

Does this answer your question? [Add Variables to Tuple](https://stackoverflow.com/questions/1380860/add-variables-to-tuple) — mkrieger1, Nov 16 '22 at 14:22

Matthias · Accepted Answer · 2022-11-16T20:54:47.760

2

Since a tuple is immutable you have to create new tuples. I assume you want to add this additional value to every tuple in the list.

a = [('1', 'hello', 'en'), ('2', 'hi', 'en')]
color = 'red'

a = [(x + (color,)) for x in a]
print(a)

The result is [('1', 'hello', 'en', 'red'), ('2', 'hi', 'en', 'red')].

If you have multiple colors in a list with as many entries as you have in your list with the tuples you can zip both sets of data.

a = [('1', 'hello', 'en'), ('2', 'hi', 'en'), ('3', 'oy', 'en')]
colors = ['red', 'green', 'blue']

a = [(x + (color,)) for x, color in zip(a, colors)]
print(a)

Now the result is

[('1', 'hello', 'en', 'red'), ('2', 'hi', 'en', 'green'), ('3', 'oy', 'en', 'blue')]

edited Nov 16 '22 at 20:54

answered Nov 16 '22 at 14:24

Matthias

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What would be the correct syntax if color is a list with the same length as a? – Andrey Kazak Nov 16 '22 at 14:56
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@AndreyKazak I added an example for this use case. – Matthias Nov 16 '22 at 20:55
Dear Matthias, kudos to you! – Andrey Kazak Nov 17 '22 at 05:33
Can the example for color list be improved for handling the following case: a = [[('1', 'hello', 'en'), ('2', 'hi', 'en')], ('3', 'dd', 'fr'), ('4', 'hi', 'ger')], where the 1st element is not a tuple, but a list of two (or more) tuples? It it better to handle using for loop, but not list comprehension? – Andrey Kazak Nov 17 '22 at 07:29
@AndreyKazak I added a code example for that. – Matthias Nov 17 '22 at 07:54

score 1 · Answer 2 · answered Nov 16 '22 at 14:26

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tuples are immutable so you cannot append(). If you want to add stuffs you should use python lists. Hope, that might help you!

answered Nov 16 '22 at 14:26

Dvip

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score 1 · Answer 3 · answered Nov 16 '22 at 14:29

1

You can convert the tuple to a list, change it, and then converting back to a tuple

a[0] = list(a[0])
a[0].append("red")
a[0] = tuple(a[0])

Just loop this for the entire list and it should work

answered Nov 16 '22 at 14:29

Thales

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Python list of tuples: increase number of tuple members

3 Answers3