Python Forum

hi all,

made a flask-wtf password website but now i want to keep logs on everytime someone changes there password either success or a failed attempt

i have loads of if statements and try/except so il add the logging to that

as this is on a windows machine can i save the logs to a file and make the file name into the time/date variable, i want it to minitor 24/7 so the logs will pile up

thanks,
rob

ok found it, il have a play

https://docs.python.org/3/howto/logging.html

You may find this interesting.

https://docs.python.org/3/library/loggin...ilehandler

I would adive to use loguru

from loguru import logger
logger.remove() # Only info to file,comment out to see live
logger.add("error.log", rotation="2 day")

@logger.catch
def foo():
    return 1 / 0

foo()

Output:
2024-07-02 18:43:12.613 | ERROR    | __main__:<module>:9 - An error has been caught in function '<module>', process 'MainProcess' (17440), thread 'MainThread' (16908):
Traceback (most recent call last):

> File "C:\code\po_env\log_py.py", line 9, in <module>
    foo()
    └ <function foo at 0x00000258C8B55BC0>

  File "C:\code\po_env\log_py.py", line 7, in foo
    return 1 / 0

ZeroDivisionError: division by zero

So simpler and better to use,error is logged with date and all info to error.log

thanks guys

how does it know what is a debug, info, warning, error, critical message, or is it up to me to say

and i know i can save the file to linux but will it save it to windows as well

(Jul-02-2024, 05:35 PM)robertkwild Wrote: [ -> ]how does it know what is a debug, info, warning, error, critical message, or is it up to me to say

Just do simple teste,eg info such as the start and end of processes.
Typically debug used to capture detailed information about the application’s behavior, variables,and internal processes.

from loguru import logger
logger.add("loop.log", rotation="1 week")
import time

start = logger.info('Start of loop')
targets = ["a", "b", "c"]
for target in targets:
    time.sleep(5)
    logger.debug(f"Log file: {target}")
end = logger.info('End of loop')

Output:
2024-07-02 20:24:34.158 | INFO     | __main__:<module>:5 - Start of loop
2024-07-02 20:24:39.162 | DEBUG    | __main__:<module>:9 - Log file: a
2024-07-02 20:24:44.163 | DEBUG    | __main__:<module>:9 - Log file: b
2024-07-02 20:24:49.165 | DEBUG    | __main__:<module>:9 - Log file: c
2024-07-02 20:24:49.165 | INFO     | __main__:<module>:10 - End of loop

(Jul-02-2024, 05:35 PM)robertkwild Wrote: [ -> ]but will it save it to windows as well

I use Windows in these examples,loguru do of course works on all OS.

thanks guys the logging is working really well, this is a snippet of my code

logger = logging.getLogger(__name__)
logging.basicConfig(filename='password.log', format='%(asctime)s:%(levelname)s:%(message)s', datefmt='%d/%m/%Y %H:%M:%S', encoding='utf-8', level=logging.DEBUG)

and ive made logs for all the if/try/except statements in my code like

logger.warning(f'{form.un.data}your current password is wrong, please click back and try again')

now i want to make new log file for every date ie 04/07/2024, 05/07/2024 etc etc, trying to do that now

ok done this and no errors on the console or log

from flask import Flask, render_template, request
from flask_wtf import FlaskForm
from wtforms import StringField, PasswordField, BooleanField, DecimalField, RadioField, SelectField, TextAreaField, FileField, SubmitField
from wtforms.validators import InputRequired, Length, DataRequired, EqualTo, Regexp, ValidationError
import re
import logging
from logging.handlers import TimedRotatingFileHandler
import time
import subprocess
import smtplib
from email.mime.text import MIMEText

logger = logging.getLogger(__name__)
logging.basicConfig(filename='password.log', format='%(asctime)s:%(levelname)s:%(message)s', datefmt='%d/%m/%Y %H:%M:%S', encoding='utf-8', level=logging.DEBUG)
handler = TimedRotatingFileHandler('password.log', when='D', interval=120)

basically i want to rotate logs every 3 months and start again ie overwrite old ones

(Jul-04-2024, 12:18 PM)robertkwild Wrote: [ -> ]ok done this and no errors on the console or log

from flask import Flask, render_template, request
from flask_wtf import FlaskForm
from wtforms import StringField, PasswordField, BooleanField, DecimalField, RadioField, SelectField, TextAreaField, FileField, SubmitField
from wtforms.validators import InputRequired, Length, DataRequired, EqualTo, Regexp, ValidationError
import re
import logging
from logging.handlers import TimedRotatingFileHandler
import time
import subprocess
import smtplib
from email.mime.text import MIMEText

logger = logging.getLogger(__name__)
logging.basicConfig(filename='password.log', format='%(asctime)s:%(levelname)s:%(message)s', datefmt='%d/%m/%Y %H:%M:%S', encoding='utf-8', level=logging.DEBUG)
handler = TimedRotatingFileHandler('password.log', when='D', interval=120)

basically i want to rotate logs every 3 months and start again ie overwrite old ones

doesnt work, changed the D to a S and made it 1 day instead of 120 and didnt rotate logs

Use loguru as suggested by @snippsat. Much simpler to use.