class pdb_constants():
    """
    this class set constants for th pdb parsing
    """

    def __init__(self):
        self.MODEL = 'MODEL '
        self.ENDMDL = 'ENDMDL'
        self.ATOM = 'ATOM'
        self.TER = 'TER'
        self.HETATM = 'HETATM'
        self.ANISOU = 'ANISOU'
        self.END = 'END'
        self.REMARK = 'REMARK'