A simple log handler implement in python

Simple log handler with log file writing.

import logging
import os
import datetime


class MyHandler(logging.Handler):
    def __init__(self):
        super().__init__()
        local_win = os.path.join(os.environ['LOCALAPPDATA'], 'Programs', 'test-bench')
        if not os.path.exists(local_win):
            os.makedirs(local_win)
        self.log_p = local_win
        self.gen = self.get_next_log_p()
        self.log_file = None
        self.file = None
        self.get_new_file()

    def get_next_log_p(self):
        x = 0
        while True:
            p = os.path.join(self.log_p, f'test_bench_log{x}.txt')
            yield p
            x = (x + 1) % 10

    def get_new_file(self):
        self.log_file = next(self.gen)
        mod = 'a'
        if os.path.exists(self.log_file) and os.path.getsize(self.log_file) >= 50 * 1024 * 1024:
            mod = 'w'
        self.file = open(self.log_file, mod, encoding='utf-8')
        self.file.write(f'\n{"-" * 40}{datetime.datetime.now()}{"-" * 40}\n')

    def emit(self, record):
        record.msg = "{}-{}:{}".format(record.funcName, record.lineno, record.msg)
        msg = self.format(record)
        print(msg)
        if os.path.getsize(self.log_file) >= 50 * 1024 * 1024:  # maxim size one file
            self.get_new_file()
        self.file.write(msg)
        self.file.write('\n')
        self.file.flush()


if __name__ == '__main__':
    han = MyHandler()
    logger = logging.getLogger('test')  # get same logger object anywhere with same name.
    formatter = logging.Formatter('%(asctime)s - %(levelname)s - %(message)s \n')
    han.setFormatter(formatter)
    logger.setLevel(logging.DEBUG)
    logger.addHandler(han)
    logger.info('test to log')