How to join strings systematically in pairs of two in Python

Question

I want to make a program that takes strings from a file - file.txt

apple
banana
horse
love
purple

and then joins the first word with every single other one and so on. The result should look like this:

applebanana
applehorse
applelove
applepurple
bananaapple
bananahorse
bananalove
bananapurple
horseapple
etc.

I get that I should probably use the join function, but I don't know how exactly? (If that makes sense, I am super sorry)

I tried also using zip, but couldn't make it word, so I leave it up to the professionals! <3 (I also use python 3) If u need more info I will try to respond as fast as I can! Thank you all!

Take a look at `itertools.product`. That will generate a few too many pairs, but those are easily filtered out. — chepner, Nov 11 '21 at 14:39
Is there anything you have tried already? You should at least try to figure something out before you post a question here. — Nathan Roberts, Nov 11 '21 at 14:40
Google searches are easy. read [here](https://www.geeksforgeeks.org/python-all-possible-pairs-in-list/) — chitown88, Nov 11 '21 at 14:44

jsofri · Answer 1 · 2021-11-11T14:53:23.887

0

words = []
with open(file_name, "r") as fp:
    words = [line.replace('\n', '') for line in fp]
for wi in words:
    for wj in words:
        print(f"{wi}{wj}")

edited Nov 11 '21 at 14:53

answered Nov 11 '21 at 14:40

jsofri

227
1
10

2

Please don't just write code for questions that have shown no attempt to solve the problem. – chepner Nov 11 '21 at 14:41
2

The `replace` function requires a replacement argument. Also, you don't need to declare `words` as an empty list if you will use a list comprehension later on. – Mitchell Olislagers Nov 11 '21 at 14:45
2

Also, don't post answers that have no explanation, only code. They _might_ seem interesting at the moment, but become problematic in the long run – MatBBastos Nov 11 '21 at 14:46

score 0 · Answer 2 · answered Nov 11 '21 at 14:46

0

#say you have a list of words 
l = ['apple', 'banana', 'horse', 'love', 'purple']

for i in range(len(l)):
    for j in range(len(l)):
        if i != j:
            print(l[i]+l[j])

answered Nov 11 '21 at 14:46

MirouDz

11
1
2

As it’s currently written, your answer is unclear. Please [edit] to add additional details that will help others understand how this addresses the question asked. You can find more information on how to write good answers [in the help center](/help/how-to-answer). – Community Nov 11 '21 at 15:06

S.B · Accepted Answer · 2021-11-11T16:03:39.450

0

This is exactly what itertools.permutations() does.

Return successive r length permutations of elements in the iterable.

from itertools import permutations

with open(<your_file>) as f:
    lst = [line.strip() for line in f]

for i, j in permutations(lst, r=2):
    print(i + j)

output:

applebanana
applehorse
applelove
applepurple
bananaapple
bananahorse
...

edited Nov 11 '21 at 16:03

answered Nov 11 '21 at 14:48

S.B

13,077
10
22
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How to join strings systematically in pairs of two in Python

3 Answers3