[Python] PyInstaller exe file doesn't create log file

I'm trying to make my scripts executable so I can send it to my colleague. I'm using PyInstaller.

pyinstaller --onefile main.py


Which creates two folders. When I open dist/main.exe, something is wrong but I don't know what because it doesn't create a log file. I can't figure out why. When I run main.py, the log file is created immediately.

Could you check it out?

# coding=utf-8
from __future__ import print_function
import csv
import os
import time
import logging
import sys
import traceback
from spider import is_connected
from database import Database
filename = os.path.join(os.path.dirname(os.path.realpath(__file__)), 'log.log')
logging.basicConfig(filename=filename, level=logging.INFO, filemode='w')

logger = logging.getLogger(__name__)
def printProgressBar(iteration, total, prefix='', suffix='', decimals=1, length=100, fill=u'█'):
"""
Call in a loop to create terminal progress bar
@params:
iteration - Required : current iteration (Int)
total - Required : total iterations (Int)
prefix - Optional : prefix string (Str)
suffix - Optional : suffix string (Str)
decimals - Optional : positive number of decimals in percent complete (Int)
length - Optional : character length of bar (Int)
fill - Optional : bar fill character (Str)
"""
percent = ("{0:." + str(decimals) + "f}").format(100 * (iteration / float(total)))
filledLength = int(length * iteration // total)
bar = fill * filledLength + '-' * (length - filledLength)
print('\r%s |%s| %s%% %s' % (prefix, bar, percent, suffix))
# Print New Line on Complete
if iteration == total:
print()


if __name__ == '__main__':
print(os.path.join(os.path.dirname(os.path.realpath(__file__)), 'log.log'))
logger.info('Download started...')
connected = is_connected()
logger.info('Checking connection... {}'.format(connected))
if not connected:
logger.info('Program closed - no connection...')
sys.exit()
db = Database()
if not os.path.isdir("output"):
print('Nenasla sa zlozka "output"...')
logger.info('No output folder')
input()
sys.exit()
if not os.path.isdir("csv"):
print('Nenasla sa zlozka "csv"...')
logger.info('No csv folder')
input()
sys.exit()

print('Spracovavanie suboru "input.csv"...')
filename = 'output_{}.csv'.format(time.strftime("%Y%m%d-%H%M%S"))
try:
with open('csv/input.csv') as f:
with open('output/'+filename, 'wb') as o:
reader = csv.DictReader(f)
reader.fieldnames.append('VAT added')
writer = csv.DictWriter(o, fieldnames=reader.fieldnames)
writer.writeheader()
r_list = list(reader)
rows = len(r_list)
for n, line in enumerate(r_list):
if n>0:
printProgressBar(n,rows)
code = line['Lot number'].strip()
vat = db.get_or_set_vat(code)
logger.info('outer vat')
logger.info(vat)
logger.info('YES' if vat else 'NO' if vat == False else 'UNKNOWN')
line['VAT added'] = 'YES' if vat else 'NO' if vat == False else 'UNKNOWN'
writer.writerow(line)
except IOError as e:
print(e)
logger.info('IOError')
logger.info(traceback.format_exc())
print('Chyba: zrejme nenaslo subor "input.csv" - skontrolujte nazov suboru v zlozke csv')
input()
sys.exit()
print()
print('Koniec stahovania - {}'.format(filename))
input()

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