how to append to a list in jinja2 for ansible

Question 1

Below is the jinja2 template that i wrote to use in ansible.

{% set port = 1234 %}
{% set server_ip = [] %}
{% for ip in host_ip  %}
{% do server_ip.append({{ ip }}:{{ port }}) %}
{% endfor %}
{% server_ip|join(', ') %}

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{% set port = 1234 %}

{% set server_ip = [] %}

{% for ip in host_ip %}

{% do server_ip.append({{ ip }}:{{ port }}) %}

{% endfor %}

{% server_ip|join(', ') %}

Below is the my desired output:

devices = 192.168.56.14:1234,192.168.56.13:1234,192.168.56.10:1234

1 2	devices = 192.168.56.14:1234,192.168.56.13:1234,192.168.56.10:1234

But when i am running the ansible playbook, it is throwing the error as below:

"AnsibleError: teme templating string: Encountered unknown tag 'do'. Jinja was looking for th: 'endfor' or 'else'

1 2	"AnsibleError: teme templating string: Encountered unknown tag 'do'. Jinja was looking for th: 'endfor' or 'else'

Any help would be appreciated..

Question 2

Try below code:

{% set port = '1234' %}
{% set server_ip = [] %}
{% for ip in host_ip  %}
{{ server_ip.append( ip+":"+port ) }}
{% endfor %}
{{ server_ip|join(',') }}

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{% set port = '1234' %}

{% set server_ip = [] %}

{% for ip in host_ip %}

{% endfor %}

You ll get:

192.168.56.14:1234,192.168.56.13:1234,192.168.56.10:1234

how to append to a list in jinja2 for ansible

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