python remove_all 后未删除 cronjob

Question

TLDR：使用 python、crontab.remove_all 似乎有效，但是当我实例化一个新的 crontab 时，我可以看到 remove_all 命令无效。

长问题：我正在尝试在我的项目中使用 cronjobs，但在此之前我希望能够测试它们。因为我不想拥有无穷无尽的作业运行，所以我首先需要能够删除它们。然而，它并没有像我想象的那样工作。

这是我的代码：

    def test_understanding_cronjobs(self):
        """
        Just trying to understand cronjobs and how to delete them.
        The main point of this experiment is to have a way to clean everything
        between each test.
        """
        # First we instanciate a crontab object.
        crontab = CronTab(user="root")

        # Then we make sure that there are no other test cronjobs running.
        # I know everything should be clean at the start of a test, but this is to show
        # that my environment is clean.
        crontab.remove_all(comment="test")
        # There should be no job at all now.
        self.assertEqual(len(crontab), 0)

        # We create a single job, with a comment that will allow us to kown that it's a test.
        # https://stackabuse.com/scheduling-jobs-with-python-crontab/
        job = crontab.new(command="ls -al /tmp", comment="test")
        job.minute.every(1)
        crontab.write()

        # At this point we should have one and only one job.
        self.assertEqual(len(crontab), 1)

        # Let's delete all test jobs.
        crontab.remove_all(comment="test")
        # There should be no job at all now.
        self.assertEqual(len(crontab), 0)

        # Just to be sure, let's create a new crontab instance and verify this information.
        clean_crontab = CronTab(user="root")
        self.assertEqual(len(clean_crontab), 0)
        # But here I get : AssertionError: 1 != 0, self.assertEqual(len(clean_crontab), 0)

如果您对那里发生的事情有任何想法，我真的很想听听。

Answer 1

crontab 只是与系统的 cron 管理交互。如果您不 write 更改，则它们不会提交，因此实例化一个新的 crontab 对象将读取现有内容，而不是“待定”工作。

    # Let's delete all test jobs.
    crontab.remove_all(comment="test")
    # There should be no job at all now.
    self.assertEqual(crontab.__len__(), 0)
    # <- changes not saved here
    # Just to be sure, let's create a new crontab instance and verify this information.
    clean_crontab = CronTab(user="root") # <- reads existing stuff from system, only goes up to the previous write

还有

 self.assertEqual(crontab.__len__(), 0)

WTF 你不应该直接调用 dunder 方法，除非你覆盖它们。

python remove_all 后未删除 cronjob

python cronjob not deleted after remove_all

python

cron