writing text file with line breaks

Question

I want to write a text file where many lines are created, so I want to know how to put each value on a new line.

this is my code:

import itertools
from itertools import permutations , combinations
lista=[]

splits=itertools.permutations('0123456789', 5)
for x in splits:
    lista.append(x)

f=open('lala.txt', 'w')
for i in lista:
    f.write(str(i))

in this part I need to put the line break: f.write(str(i))

I have tried with: f.write(str(i)\n) but gives me an error

Answer 1

You can use:

f.write(str(i) + '\n')

Answer 2

Since your lines are already in a list, you can use writelines():

import itertools

lista = [",".join(i)+'\n' for i in itertools.permutations('0123456789',5)]

with open('lala.txt', 'w') as f:
    f.writelines(lista)

I've used the with statement which will automatically close the file for you; and used a list comprehension to create your initial list of permutations.

Answer 3

Editing the list itself might be undesirable. In such cases, you could csv module:

import itertools, os, csv

lista = list(itertools.permutations('0123456789',5))

with open('lala.txt', 'w', newline=os.linesep) as f:
    writer = csv.writer(f, quoting=csv.QUOTE_NONE)
    writer.writerows(lista)

The quoting=csv.QUOTE_NONE is to remove the " marks presented because the permuted items are strings.