retry_main.py

def decorate_msg(msg, width, str_fmtmeth):
    msg = "[" + msg + "]" if str_fmtmeth is None else f"[{getattr(str, str_fmtmeth)(msg)}]"
    return msg.center(width, "*")

def emit_sectioned_stdout(
    *msg_payloads,
    header="attention", footer="", fmt_meth="upper", width=70,
    **print_kwargs
):
    print(decorate_msg(header, width, fmt_meth))
    if len(msg_payloads) == 0: return
    print(*msg_payloads, **print_kwargs)
    print("*" * width if len(footer) == 0 else decorate_msg(footer, width, fmt_meth))

def call_with_verbose_retry(main_fn, *args, seconds_before_retry=60, **kwargs):
    try:
        main_fn(*args, **kwargs)
    except Exception as e:
        import traceback, sys
        emit_sectioned_stdout(
            traceback.format_exc(),
            header="caught generic exception"
        )
        sys.stdout.flush(); sys.stderr.flush()
        import time; time.sleep(seconds_before_retry)
        try:
            main_fn(*args, **kwargs)
        except Exception as e:
            raise e from None # remove traceback from previous try

if __name__ == "__main__": # adhoc demo: function which causes nested error
    def _main():
        some_mapping = {}
        try:
            1/0
        except ZeroDivisionError:
            some_mapping["somekey"]
            print("Hmm. This shouldn't be reached. Ever!")

    call_with_verbose_retry(_main)