def GetDiagnostics(self, cron_time_field):
    diagnostics = []
    self.CheckRange(diagnostics, cron_time_field)
    self.CheckLowNum(diagnostics, self._start, cron_time_field)
    self.CheckHighNum(diagnostics, self._end, cron_time_field)
    return diagnostics
see if we're at the root or not
dataset/ETHPy150Open lyda/chkcrontab/chkcrontab_lib.py/CTRange.GetDiagnostics--crossover with--dataset/ETHPy150Open biocore/scikit-bio/skbio/tree/tests/test_tree.py/TreeTests.test_is_root