Jinja2 template output parsing issue for comma

Question

I have wrote the jinja2 template for ansible playbook. However, i dont want the comma at the end of last line for that reason, i have used the "if" condition with "loop.last". Since there is "for" loop and "if" loop, last line is executing two times - one with comma and another without comma. any help would be appreciated for the last line to be executed once without comma.

  [{% for ip in range  %}
  "127.0.0.1:{{ ip }}",
     {% if loop.last %}
       "127.0.0.1:{{ ip }}"
     {% endif %}
  {% endfor %}]

Below is the output that i am getting,

[  "127.0.0.1:6000",
         "127.0.0.1:6001",
         "127.0.0.1:6002",
         "127.0.0.1:6003",
         "127.0.0.1:6004",
         "127.0.0.1:6005",
         "127.0.0.1:6006",
            "127.0.0.1:6006"
       ]

Expected output:

  ["127.0.0.1:6000", "127.0.0.1:6001", "127.0.0.1:6002", "127.0.0.1:6003", "127.0.0.1:6004", "127.0.0.1:6005", "127.0.0.1:6006" ]

Thanks

Answer 1

you could add an else clause for the non last iterations. try this template file:

[{% for ip in range  %}
{% if loop.last %}
"127.0.0.1:{{ ip }}"{% else %}
"127.0.0.1:{{ ip }}", {% endif %}
{% endfor %}]

produced file:

[root@greenhat-30 tests]$ cat /tmp/test.out         
["127.0.0.1:6001", "127.0.0.1:6002", "127.0.0.1:6003", "127.0.0.1:6004", "127.0.0.1:6005", "127.0.0.1:6006"]
[root@greenhat-30 tests]$ 

hope it helps