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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 memory_usage(self, key, samples=None):
 """ Return the total memory usage for key, its value and associated administrative overheads. For nested data structures, ``samples`` is the number of elements to sample. If left unspecified, the server's default is 5. Use 0 to sample all elements. """

        args = []
        if isinstance(samples, int):
            args.extend([Token.get_token('SAMPLES'), samples])
        return self.execute_command('MEMORY USAGE', key, *args)