[Question] display logs

[3mora2]

Question

what Best way to display logs in app?

Code sample

No response

Error message

No response

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• I have searched for answers to my question both in the issues and in previous discussions.

[FeodorFitsner]

We've just released Flet 0.19.0 with some improvements in this area.

1. All output to StdOut and StdErr (e.g. all print() statements) is now redirected to out.log file. All writes to that file are unbuffered, so you can retrieve a log in your Python program at any moment with a simple:

with open("out.log", "r") as f:
    log = f.read()

You can use AlertDialog or any other control to display the value of log variable.

2. You can terminate the program and display entire log in a scrollable window by calling sys.exit() with exit code 100 (magic code).

import sys
sys.exit(100)

All other exit codes will terminate (close) the program without displaying a log.

[3mora2]

I can't find out.log file, should I create it?

[3mora2]

it create when run flet build but i am still use flet pack, it best for me.
my solution

import logging
import tempfile
import os


TemporaryLogFile = os.path.join(tempfile.gettempdir(), "Alister_log.log")

format = '%(name)s:%(levelname)s:%(message)s'

logging.basicConfig(
    level=logging.INFO,
    format=format,
    filename=TemporaryLogFile,
    filemode="w"
)

Logger = logging.getLogger("ALister")


# console_handler = logging.FileHandler(filename="out.log", mode="w")
# To show Log when debug, you need comment console_handler when pack
console_handler = logging.StreamHandler()
console_handler.setFormatter(logging.Formatter(format))
Logger.addHandler(console_handler)


class OutputLogger:
    def __init__(self, name="root", level="INFO"):
        self.level = getattr(logging, level)
        self.old = ""

    def write(self, msg: str, level=None):

        try:
            level = getattr(logging, level) if level else self.level
            if msg and not msg.isspace():
                if level == logging.ERROR:
                    if msg.endswith("\n"):
                        msg = msg.rstrip()
                    if msg in ["^", "~", " ", "\t"]:
                        self.old += msg
                        return
            else:
                return
            if self.old:
                Logger.log(level, self.old)
                self.old = ""

            Logger.log(level, msg)
        except:
            pass

    def isatty(self):
        return True

    def flush(self):
        pass

    def fileno(self):
        return False

import sys
import flet as ft


def main(page: ft.Page):
    # Check New update
    # if check_update(page) is True:
    #     page.window_close()
    #     exit()
    # Setup Language and app dir
    # set_trans(page)
    # Start App
    NavigationBar(page)
    # When Finish redirect all output to logger
    # It need to add after setup app to run hot reload correct
    sys.stdout = OutputLogger(name="StdOUT")
    sys.stderr = OutputLogger(name="StdERROR", level="ERROR")


# if __name__ == "__main__":

ft.app(target=main, assets_dir="assets")