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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def robust_rmtree(self, path, max_retries=3):
 """Robustly tries to delete paths. Retries several times (with increasing delays) if an OSError occurs. If the final attempt fails, the Exception is propagated to the caller. Borrowing patterns from: https://github.com/hashdist/hashdist """

        
        delay = 1
        for _ in range(max_retries):
            try:
                shutil.rmtree(path)
                break
            except OSError:
                logger.debug('Unable to remove path: {}.  Retrying in {} seconds.'.format(path, delay))
                time.sleep(delay)
                delay *= 2

        if os.path.exists(path):
            # Final attempt, pass any Exceptions up to caller.
            shutil.rmtree(path)