code: def from_archive(cls, filename,snapshot=-1):
          
          warnings.warn( "rebound.Simulation.from_archive(filename,snapshot) is deprecated and will be removed in the future. Use rebound.Simulation(filename,snapshot) instead", FutureWarning)
          return cls(filename=filename,snapshot=snapshot)
docs: rebound.Simulation.from_archive(filename,snapshot) is deprecated and will be removed in the futute. Use rebound.Simulation(filename,snapshot) instead