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Python: Write a list of tuples to a file

Answer 1

+4 A:

fp.write('\n'.join('%s %s' % x for x in mylist))

Ignacio Vazquez-Abrams 2010-09-29 09:33:44

+1 But you should explain what fp is.

Andrei Ciobanu 2010-09-29 09:38:18

`str.format` is the new idiom for formatting strings: http://www.python.org/dev/peps/pep-3101/. Although I'm sure `%` will last for many many moons... =)

katrielalex 2010-09-29 09:38:55

also, `str.format` takes 2/3 the time.

aaronasterling 2010-09-29 11:00:28

Answer 2

+3 A:

import csv
with open(<path-to-file>, "w") as the_file:
    csv.register_dialect("custom", delimiter=" ", skipinitialspace=True)
    writer = csv.writer(the_file, dialect="custom")
    for tup in tuples:
        writer.write(tup)

The csv module is very powerful!

katrielalex 2010-09-29 09:34:05

+1 for `with`. `Csv` is nice but optional.

Manoj Govindan 2010-09-29 09:42:37

Answer 3

A:

Thanks guys. Here is the third way that I came up with:

for number, letter in myList:
    of.write("\n".join(["%s %s" % (number, letter)]) + "\n")

Adia 2010-09-29 10:53:14

you don't need to turn it into a list to pass to `join`. other then that, it's almost exactly like Ignacio's answer, so you should probably accept his by clicking the checkmark under the votecount next to his answer..

aaronasterling 2010-09-29 11:12:07

I did accept his answer:)

Adia 2010-09-29 12:02:26

Answer 4

+1 A:

open('filename', 'w').write('\n'.join('%s %s' % x for x in mylist))

stan 2010-09-29 11:59:41

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Python: Write a list of tuples to a file

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