code: def exists(fname):
      
      fname = stypes.stringToCharP(fname)
      return bool(libspice.exists_c(fname))
docs: Determine whether a file exists.
  
      http://naif.jpl.nasa.gov/pub/naif/toolkit_docs/C/cspice/exists_c.html
  
      :param fname: Name of the file in question.
      :return: True if the file exists, False otherwise.
      :rtype: bool