How to convert list pairs into tuple pairs

Question

How do you turn a list that contain pairs into a list that contains tuple pairs by using easy programming e.g for loop? x,y = ...?

My code:

def read_numbers():
    numbers = ['68,125', '113,69', '65,86', '108,149', '152,53', '78,90']
    numbers.split(',')
    x,y = tuple numbers
    return numbers

desire output:

[(68,125), (113,69), (65,86), (108,149), (152,53), (78,90)]

please search accross the web: http://code.activestate.com/recipes/303060-group-a-list-into-sequential-n-tuples/ — Colonel Beauvel, May 30 '16 at 06:39
Possible duplicate of [Combine a list into tuple pairs (x, y) - Python](http://stackoverflow.com/questions/30769734/combine-a-list-into-tuple-pairs-x-y-python) — Serenity, May 30 '16 at 07:02

score 2 · Accepted Answer · answered May 30 '16 at 06:46

2

def read_numbers():
    numbers = ['68,125', '113,69', '65,86', '108,149', '152,53', '78,90']
    return [tuple(map(int,pair.split(','))) for pair in numbers]

answered May 30 '16 at 06:46

control_fd

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thank you! it worked! How can you do this without the map() method? – S.Jackson May 30 '16 at 06:48

2342G456DI8 · Answer 2 · 2016-05-30T07:15:36.760

2

Try this by using nested list comprehension:

o = [tuple(int(y) for y in x.split(',')) for x in numbers]

edited May 30 '16 at 07:15

answered May 30 '16 at 06:50

2342G456DI8

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You can omit the `[]` brackets in the `tuple` constructor. No need build a `list`, just pass the generator expression. – user2390182 May 30 '16 at 07:09

Moon Cheesez · Answer 3 · 2016-05-30T07:29:07.563

Just use list comprehension. Read more about it here!

# Pass in numbers as an argument so that it will work
# for more than 1 list.
def read_numbers(numbers):
    return [tuple(int(y) for y in x.split(",")) for x in numbers]

Here is a breakdown and explanation (in comments) of the list comprehension:

[
    tuple(                              # Convert whatever is between these parentheses into a tuple
            int(y)                      # Make y an integer
            for y in                    # Where y is each element in
            x.split(",")                # x.split(","). Where x is a string and x.split(",") is a list
                                        # where the string is split into a list delimited by a comma.
    ) for x in numbers                  # x is each element in numbers
]

However, if you are just doing it for one list, there is no need to create a function.

You can omit the `[]` brackets in the `tuple` constructor. No need build a `list`, just pass the generator expression. — user2390182, May 30 '16 at 07:09

score 0 · Answer 4 · answered May 30 '16 at 08:52

Try this :

def read_numbers():
    numbers = ['68,125', '113,69', '65,86', '108,149', '152,53', '78,90']
    final_list = []
    [final_list.append(tuple(int(test_str) for test_str in number.split(','))) for number in numbers]
    return final_list

How to convert list pairs into tuple pairs

4 Answers4