3_0-jinja2-vars.yml

---
- hosts: serverf
  vars:
    my_name: demOn stUdent
  tasks:
    - name: print message
      debug:
        msg:
          - "This is my name {{ my_name }}"               # 输出原始信息
          - "This is my name {{ my_name | lower}}"        # 输出内容全部【小】写
          - "This is my name {{ my_name | upper}}"        # 输出内同全部【大】写
          - "This is my name {{ my_name | capitalize}}"   # 输出字符【段】首字母大写
          - "This is my name {{ my_name | title}}"        # 输出字符【串】首字母大写
          - "This is my name {{ real_name | default ('ANDY')}}" # 未定义的 key 使用 default ，将 value 赋给 key

输出结果

[student@Workstation project_test]$ ansible-playbook 3_0-jinja2_vars.yml 

PLAY [serverf] **************************************************************************

TASK [Gathering Facts] **************************************************************************
ok: [serverf]

TASK [print message] **************************************************************************
ok: [serverf] => {
    "msg": [
        "This is my name demOn stUdent",
        "This is my name demon student",
        "This is my name DEMON STUDENT",
        "This is my name Demon student",
        "This is my name Demon Student",
        "This is my names ANDY"
    ]
}

PLAY RECAP *********************************************************************************************************************************************************
serverf                    : ok=2    changed=0    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0