Unable to write files in python

Question

Today, I was testing my old python script, it was about fetching some details from an API and write then in a file. Until my last test it was working perfectly fine but today when I executed the script it worked, I mean no error at all but it neither write nor created any file. The API is returning complete data - I tested on it terminal, then I created another test.py file to check if file write statements are working, so the result was - they were not working. I don't know what is causing the issue, it also ain't giving any error.

This is my sample TEST.PY file

filename = "domain.log"

with open(filename, 'a') as domain_file:
    domain_file.write("HELLO\n")
    domain_file.write("ANOTHER HELLO\n")

Thank you

This works perfectly fine for me. Maybe you are not checking the right place? It created the file and wrote in it. Then running it again, it simply appends. — Rigerta
– Rigerta, Commented Apr 16, 2020 at 11:52
I don't know what was causing the issue, it is now working for me too. Thanks anyways — Abdullah
– Abdullah, Commented Apr 16, 2020 at 11:58

Taylor D. Edmiston · Accepted Answer · 2020-04-16 11:59:01Z

1

Using 'a' on the open call to open the file in append mode (as shown in your code) should work just fine.

I don't think your issue is on the Python side. The next thing to check are your directory permissions:

$ ls -al domain.log
-rw-r--r--  1 taylor  staff  60 Apr 16 07:57 domain.log

Here's my output after running your code a few times:

$ cat domain.log
HELLO
ANOTHER HELLO
HELLO
ANOTHER HELLO
HELLO
ANOTHER HELLO

edited Apr 16, 2020 at 11:59

answered Apr 16, 2020 at 11:51

Taylor D. Edmiston

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4 Comments

Patrick Artner Over a year ago

"a" works - if a file does not exist, it gets created.whats being written to it, is appended.

Taylor D. Edmiston Over a year ago

Then I think your code is fine. Check that you have permission to write to disk with ls -al domain.log.

Taylor D. Edmiston Over a year ago

Thank you - updated my answer with sample output for verification.

Abdullah Over a year ago

thank you so much, I tested the script again, it is now working, I don't know what was causing the issue but it is now working

Matin Zadeh Dolatabad · Accepted Answer · 2020-04-16 11:54:13Z

0

It may be related to file permission or its directory. Use ls -la to see file and folder permissions.

answered Apr 16, 2020 at 11:54

Matin Zadeh Dolatabad

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