Ansible: How to append string to each value of list

Question

I'm trying to append a string to each value of a list in ansible, so basically am trying to install multiple pip modules offline using .whl files.

I have two files in /opt/tmp/ path

vars:
 DIR: /opt/
 pymongo_modules:
   - pip-19.1.1-py2.py3-none-any.whl
   - pymongo-3.8.0-cp27-cp27mu-manylinux1_x86_64.whl
 
- name: Install the latest pymongo package 
  pip:
    name: "{{DIR}}/tmp/{{ pymongo_modules | join(' ') }}"
    executable: "{{pip_path}}"

The above is not working because it's formating like below

"name": ["/opt/tmp/pip-19.1.1-py2.py3-none-any.whl pymongo-3.8.0-cp27-cp27mu-manylinux1_x86_64.whl"]

I can achieve the same with below syntax but I'm getting deprecation warning

- name: Install the latest pymongo package 
  pip:
    name: "{{DIR}}/tmp/{{ module }}"
    executable: "{{pip_path}}"
  with_items:
   - "{{ pymongo_modules }}"
  loop_control:
        loop_var: module

Expecting value:

"name": ["/opt/tmp/pip-19.1.1-py2.py3-none-any.whl", "/opt/tmp/pymongo-3.8.0-cp27-cp27mu-manylinux1_x86_64.whl"]

Answer 1

Use product filter like below. BTW, DIR variable already ends with a / so do not need an additional / before tmp.

- debug: 
    msg: "{{ item }}"
  loop: "{{ [(DIR  + 'tmp')] | product(pymongo_modules) | map('join', '/') | list }}"

Gives:

ok: [localhost] => (item=/opt/tmp/pip-19.1.1-py2.py3-none-any.whl) => {
    "msg": "/opt/tmp/pip-19.1.1-py2.py3-none-any.whl"
}
ok: [localhost] => (item=/opt/tmp/pymongo-3.8.0-cp27-cp27mu-manylinux1_x86_64.whl) => {
    "msg": "/opt/tmp/pymongo-3.8.0-cp27-cp27mu-manylinux1_x86_64.whl"
}