def METHOD_NAME(self, psa_constant_names):
    """Run psa_constant_names to obtain names for observed numerical values."""
    values = [str(value) for value in self.codes]
    cmd = [psa_constant_names, 'status'] + values
    output = subprocess.check_output(cmd).decode('ascii')
    for value, name in zip(values, output.rstrip().split('\n')):
        self.status_names[value] = name