Writing integers into a new file

Question

So I am trying to open a new file, and write in to that file all the values of n.

for n in [4, 7, 8, 10, 6, 3, 5, 13]:
    if n > 5:
        print(n)
b = open('new', 'w')
b.write(n)

It writes the numbers in as a string and only writes in 13, the last n.

I think you're opening the file with `w`, meaning 'write', and you're overwriting previous writes you do to that file. Try `a` for append, I think. — Chris Sprague, Jun 30 '16 at 14:03
Also you're doing it **outside the loop**, after it has completed. — jonrsharpe, Jun 30 '16 at 14:03
Possible duplicate of [How do you append to a file in Python?](http://stackoverflow.com/questions/4706499/how-do-you-append-to-a-file-in-python) — , Jun 30 '16 at 14:04

Devi Prasad Khatua · Answer 1 · 2016-06-30T14:11:32.303

1

Modified code:

with open('new', 'w') as outfile:
    for n in [4, 7, 8, 10, 6, 3, 5, 13]:
        if n > 5:
            print(n)
            outfile.write(str(n))

or (Not recommended)

for n in [4, 7, 8, 10, 6, 3, 5, 13]:
    if n > 5:
        print(n)
        b = open('new', 'a') # append mode
        b.write(str(n))
        b.close()

edited Jun 30 '16 at 14:11

answered Jun 30 '16 at 14:05

Devi Prasad Khatua

1,185
3
11
23

score -1 · Accepted Answer · answered Jun 30 '16 at 14:08

-1

You are printing the last value only. So you are getting the result only 13.You have to write the value in the for loop.

b = open('new', 'w')
for n in [4, 7, 8, 10, 6, 3, 5, 13]:
    if n > 5:
        print(n)
        b.write(n)

answered Jun 30 '16 at 14:08

SumanKalyan

1,681
14
24

`write()` expects a character buffer object, and even you are not closing the file, run locally and then post! – Devi Prasad Khatua Jun 30 '16 at 14:14

Writing integers into a new file

2 Answers2