src/exception.py

import sys
import logging
def error_message_detail(error,error_detail:sys):
    _,_,exc_tb = error_detail.exc_info()
    file_name =exc_tb.tb_frame.f_code.co_filename
    error_message = "error occured in python script name [{0}] line number [{1}] error message [{2}]".format(file_name,exc_tb.tb_lineno,str(error))

    return error_message

class CustomException(Exception):
    def __init__(self,error_message,error_detail:sys) -> None:
        super().__init__(error_message)
        self.error_message =  error_message_detail(error_message,error_detail=error_detail)
    def __str__(self) -> str:
        return self.error_message    

if __name__ == "__main__":

    try:
        a = 1/0
    except Exception as e:
        logging.info("Logging has started")
        raise  CustomException
    finally:
        logging.info(CustomException(e,sys))