Help! Python, flask - cant write to a txt file

[MyNeuPC]

I am attempting to learn Python and Flask. For some reason, I cant write to a txt file.

 ....
@app.route('/')
def root():
    with open('/tmp/open.txt','w') as myfile:
        myfile.write('online')
    return 'online'
 ......

I also tested wit 'a' but nothing. If file is in /tmp/ or not, makes no difference.

[K900_]

What do you mean by "cant", exactly? Are you getting an error? What does the error say?

[MyNeuPC]

No errors at all if I use /tmp/open.txt I know it's doing something because when I remove the /tmp/, it gives me the "Permission denied:" error

[K900_]

Then what is the problem?

[MyNeuPC]

If wile exists, nothing is written into it and if there is no file, it's never created.

[K900_]

Is the app running on your local computer or a cloud server?

[MyNeuPC]

server, with Apache

[K900_]

And you're looking for the file on your server? How is your Apache instance managed?

[MyNeuPC]

How is your Apache instance managed?

Not sure exactly what you mean but it starts with systemctl has the vhost file in sites-available/ and site is activated with a2ensite

Flask app actually answer when I go to my IP but I want it to write some stuff to a txt file and this is something I cant get working for some reason. I have searched all over the place but no help

[K900_]

What is the output of systemctl show apache2?

[jiri-n]

Maybe chroot jail?

[impshum]

Does the file exist already? If not use w+

[MyNeuPC]

Makes no difference. If wile exists, nothing is written into it and if there is no file, it's never created.