Convert an integer variable to a `first_digit.second_digit` format

I want convert an integer variable into a specific string format.
This integer (for example: 56, 71, 80) needs to be converted into a string formatted first_digit.second_digit (for example 5.6, 7.1).

How can I do this?

I tried a mixture of Python and Jinja but it doesn't work.

With:

- name: Install PHP > 5.6
  apt: 
    name: 
      - "php{{ str(php) | php[0]+'.'+php[1] }}"    
  when: php > 56

I get this error:

template error while templating string: expected token 'end of print statement', got '['. String: php{{ str(php) | php[0]+'.'+php[1] }}

Solution

Given the variable

  php: 56

Convert the integer to a string and split the first digit from the rest (this will work while the PHP major version is a single digit)

  php_str: "{{ php|string }}"
  php_ver: "{{ php_str[0] }}.{{ php_str[1:] }}"

To test the version you can declare a variable. For example,

  php_ver_min: '5.5'

and try the debug

    - debug:
        msg: "Install php{{ php_ver }}"
      when: php_ver is version(php_ver_min, '>=')
      vars:
        php_str: "{{ php|string }}"
        php_ver: "{{ php_str[0] }}.{{ php_str[1:] }}"

gives

  msg: Install php5.6

^{Example of a complete playbook for testing
- hosts: localhost

vars:

php: 56
php_ver_min: '5.5'

tasks:

- debug:
msg: "Install php{{ php_ver }}"
when: php_ver is version(php_ver_min, '>=')
vars:
php_str: "{{ php|string }}"
php_ver: "{{ php_str[0] }}.{{ php_str[1:] }}"}