我尝试使用 ansible community.general.cpanm 安装多个 Perl 模块：

- name: Install perl packages
  debug:
    msg: "{{ item }}"
  loop: "{{ imperia__cpan_packages }}"

- name: Install perl packages
  cpanm:
    name: "{{ item }}"
  loop: "{{ imperia__cpan_packages }}"

一开始我以为我犯了一个语法错误，但后来我发现，只要模块名称超过一个单词，我就会收到此错误：

TASK [myplaybook : Install perl packages] *****************************************
ok: [localimp] => (item=CPAN) => {
    "msg": "CPAN"
}
ok: [localimp] => (item=DBI) => {
    "msg": "DBI"
}
ok: [localimp] => (item=DBD::SQLite) => {
    "msg": "DBD::SQLite"
}
ok: [localimp] => (item=JCRISTY/Image-Magick-6.9.12-1.tar.gz) => {
    "msg": "JCRISTY/Image-Magick-6.9.12-1.tar.gz"
}

TASK [myplaybook : Install perl packages] *****************************************
ok: [localimp] => (item=CPAN) => {"ansible_loop_var": "item", "binary": null, "changed": false, "item": "CPAN", "name": "CPAN", "version": null}
ok: [localimp] => (item=DBI) => {"ansible_loop_var": "item", "binary": null, "changed": false, "item": "DBI", "name": "DBI", "version": null}
An exception occurred during task execution. To see the full traceback, use -vvv. The error was: TypeError: 'NoneType' object is not iterable
failed: [localimp] (item=DBD::SQLite) => {"ansible_loop_var": "item", "binary": null, "changed": false, "item": "DBD::SQLite", "msg": "Module failed with exception: 'NoneType' object is not iterable", "name": "DBD::SQLite", "output": {"binary": null, "name": "DBD::SQLite", "version": null}, "vars": {"binary": null, "name": "DBD::SQLite", "version": null}, "version": null}
An exception occurred during task execution. To see the full traceback, use -vvv. The error was: TypeError: 'NoneType' object is not iterable
failed: [localimp] (item=JCRISTY/Image-Magick-6.9.12-1.tar.gz) => {"ansible_loop_var": "item", "binary": null, "changed": false, "item": "JCRISTY/Image-Magick-6.9.12-1.tar.gz", "msg": "Module failed with exception: 'NoneType' object is not iterable", "name": "JCRISTY/Image-Magick-6.9.12-1.tar.gz", "output": {"binary": null, "name": "JCRISTY/Image-Magick-6.9.12-1.tar.gz", "version": null}, "vars": {"binary": null, "name": "JCRISTY/Image-Magick-6.9.12-1.tar.gz", "version": null}, "version": null}

PLAY RECAP *********************************************************************

到目前为止，我的研究还不是很成功，因为错误 模块失败并出现异常：'NoneType' 对象不可迭代 可能有很多原因……