Looping over a tuple of tuples

Question

I have a tuple of tuples:

COUNTRIES = (
    ('AFG', 'Afghanistan'),
    ('ALA', 'Aland Islands'),
    ('ALB', 'Albania'),
    ('DZA', 'Algeria'),
    ('ASM', 'American Samoa')
)

I tried:

if country in COUNTRIES[0] and didn't worked - I understand why;

Besides looping over the main tuple and check one by one, there is something similar to 'in' ?

because Python is case-sensitive. `COUNTRIES` is not the same as `Countries`. What error did you get? — Ma0, May 15 '18 at 13:55
What is your question? I do not understand the last sentence. — Ma0, May 15 '18 at 13:57
@Ev. Kounis , thanks, was just a typing mistake; I have a country str that correspond to the first element of the each tuple; my question is beside using for and going thru all of then, and inside the loop using if, are any other more pythonic solutions — user3541631, May 15 '18 at 14:17

score 3 · Accepted Answer · answered May 15 '18 at 13:58

3

I would use chain in this case.

from itertools import chain

COUNTRIES = (
    ('AFG', 'Afghanistan'),
    ('ALA', 'Aland Islands'),
    ('ALB', 'Albania'),
    ('DZA', 'Algeria'),
    ('ASM', 'American Samoa')
)

if 'Albania' in chain.from_iterable(COUNTRIES):
    # do something

answered May 15 '18 at 13:58

BcK

2,548
1
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I need to check ALA, the 0, first element not second – user3541631 May 15 '18 at 15:01

Mattias Backman · Answer 2 · 2018-05-15T14:08:30.110

2

It looks like you might want to use a dict. What about this?

COUNTRIES = {
    'AFG': 'Afghanistan',
    'ALA': 'Aland Islands',
    'ALB': 'Albania',
    'DZA': 'Algeria',
    'ASM': 'American Samoa'
}

country = "AFG"
if country in COUNTRIES:
    print "I found " + COUNTRIES[country]

edited May 15 '18 at 14:08

answered May 15 '18 at 14:02

Mattias Backman

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you don't want `in COUNTRIES.keys()` in python 2... – Jean-François Fabre May 15 '18 at 14:04
@Jean-FrançoisFabre Sure, but the question is tagged Python3? – Mattias Backman May 15 '18 at 14:05
okay, just do `in COUNTRIES` shorter and fast whatever python version – Jean-François Fabre May 15 '18 at 14:07
@Jean-FrançoisFabre Yeah, that's true. Fixed. Thanks. :) – Mattias Backman May 15 '18 at 14:08
Note that if you already have the tuple of tuples, you can just say `d = dict(COUNTRIES)` to create the `dict` shown here. – chepner May 15 '18 at 14:51

Looping over a tuple of tuples

2 Answers2