Python 条件不满足时如何跳过任务

如果my_环境变量为“prod”，则具有以下任务的角色，该任务应创建cron作业

当条件不满足时，我希望剧本跳过此任务，而不是失败：

---
- name: Configure cron job to export patch logs
  cron:
    name: export patch logs daily
    minute: 0
    hour: 0
    user: root
    cron_file: patch_logs
    job: "/usr/local/bin/aws s3 cp /var/log/dpkg.log s3://{{ patch_logs_bucket }}/dpkg.log.$(hostname).$(date +\\%F)"
  when: my_environment == "prod"

失败消息：

TASK [ansible-contxt-base : Configure cron job to export patch logs] ***********
    fatal: [ubuntu-1604]: FAILED! => {"msg": "The conditional check 'scx_environment == \"prod\"' failed. The error was: error while evaluating conditional (scx_environment == \"prod\"): 'my_environment' is undefined\n\nThe error appears to have been in '/**<path>**/tasks/base.yml': line 125, column 3, but may\nbe elsewhere in the file depending on the exact syntax problem.\n\nThe offending line appears to be:\n\n\n- name: Configure cron job to export patch logs\n  ^ here\n"}

TASK[ansible contxt base:配置cron作业以导出修补程序日志]***********
致命：[ubuntu-1604]：失败！=>{“msg”：“条件检查'scx\U环境==\“prod\””失败。错误为：计算条件时出错（scx\U环境==\“prod\”）：“my_environment”未定义\n\n错误似乎出现在“/**/tasks/base.yml”中：第125行第3列，但可能\n出现在文件的其他位置，具体取决于语法问题。\n\n出现问题的行可能是：\n\n\n-name:Configure cron job to export patch log\n^此处\n“}

我们可以使用jinja2快捷方式来表示“默认（错误）”：d（错误）”

在这里找到

或

---

请解释一下

when:

my_environment is defined

my_environment != ”prod”

when: my_environment|d(False) == "prod"

- shell: echo "This certainly isn't epic!"
  when: not epic

- fail: msg="Bailing out. this play requires 'bar'"
  when: bar is undefined