human
I wrote the below code

    if (retry_exceptions is None):
        retry_exceptions = RETRY_EXCEPTIONS
    if (retry_delay is None):
        retry_delay = DEFAULT_DELAY
    if (timeout is None):
        timeout = DEFAULT_TIMEOUT
    if (backoff is None):
        backoff = DEFAULT_BACKOFF
    timeout = max(timeout, 0)
    def transform_ssl_error(func, *args, **kwargs):
        try:
            return func(*args, **kwargs)
        except ssl.SSLError:
            exc = sys.exc_info()[1]
            if (TRANSIENT_SSL_ERROR in str(exc)):
                raise TransientSSLError(*exc.args)
            raise exc
    def decorator(func):
        @wraps(func)
        def retry_loop(*args, **kwargs):
            current_delay = retry_delay
            end = (datetime.now() + timedelta(seconds=timeout))
            while True:
                try:
                    return transform_ssl_error(func, *args, **kwargs)
                except retry_exceptions:
                    exc = sys.exc_info()[1]
                    if isinstance(exc, RateLimitReachedError):
                        time.sleep(exc.retry_after)
                        current_delay = retry_delay
                        end = (datetime.now() + timedelta(seconds=(exc.retry_after + timeout)))
                    elif (datetime.now() >= end):
                        raise
                    else:
                        time.sleep(current_delay)
                        current_delay *= backoff
        return retry_loop
    return decorator

What's a good function header?
 Here's a good function header?
assistant
#Here's a good function header.

def retry(retry_exceptions=RETRY_EXCEPTIONS, retry_delay=DEFAULT_DELAY, timeout=DEFAULT_TIMEOUT, backoff=DEFAULT_BACKOFF):