The solution you found works in your computer, but it'll break if you try to use the module anywhere else. A better solution is to get the path of your module, then append the .txt file name:

def get_txt_path():
    directory_path = os.path.dirname(os.path.abspath(inspect.getfile(inspect.currentframe())))
    return os.path.join(directory_path, 'filename.txt')

By the way, unless you have a good reason not to do so, I advise you to use "with open(...) as logFile:" instead of "logFile = open(...)", since it makes sure it'll always close the file, even if there's an exception. Otherwise, you might leak file handles.

Hello, please help i'm having the same problem and i did what u adviced but i still can't write the txt file,

im creating a module in odoo 8 , using ubuntu 18 and  docker.

this is my code :

from openerp import models, fields, api
import os

class odooimppn(models.Model):
    _name = 'odoo_imppn.content'
    _description = 'Odoo imppn content'

    def test(self):
        results = "this is a test to see if we are able to write on a text file located inside the module"
        path = os.path.expanduser('./etc/odoo/addons/odoo_imppn/IMPPN_tests.txt')
        fileIMPPN = open(path, 'r+')
        fileIMPPN.write(results)
        fileIMPPN.close()

test()