create ansible dict from two list with a condition

Question

I have many strings like this stored in list one

set bgp x vlan y tags-vlan bgp z,
set bgp x1 vlan y1 tags-vlan bgp z1,
.
.
.
.

and a second list contain values like this:

f,
j,
h,
m

from the first list of strings, i want to trim it and create from it a dict that contain values in this form:

bgp: x
vlan:y
tags-vlan bgp:z
-----
(to be added) details: p

and then add to the dict a fourth key called "details" which it's value is equal to the third value "h" in the second list, but add this key to the dict only when each time j == z, meaning second element of second list must equal third key value in newly made dict z and both have numeric value then add h to dict with the key name details.

the result is a dictionary like this, with h value being added with condition whenver z == j

bgp: x
vlan:y
tags-vlan bgp:z
details: h

Hi and welcome to SO. Please [edit] your question and format your code/output/examples correctly. Check the buttons on top of the editor and the help button for further information. Thanks. — Zeitounator, Nov 21 '22 at 11:09

score 0 · Accepted Answer · answered Nov 22 '22 at 03:21

^{Given the strings
s1: |-
set bgp x vlan y tags-vlan bgp z,
set bgp x1 vlan y1 tags-vlan bgp z1,
set bgp x2 vlan y2 tags-vlan bgp j
s2: |-
f,
j,
h,
m}

Split the lines

  l1: "{{ s1|split('\n')|join()|split(',') }}"
  l2: "{{ s2|split('\n')|join()|split(',') }}"

gives

  l1:
  - set bgp x vlan y tags-vlan bgp z
  - set bgp x1 vlan y1 tags-vlan bgp z1
  - set bgp x2 vlan y2 tags-vlan bgp j

  l2:
  - f
  - j
  - h
  - m

Using the condition

If

 'the second item of the second list' == 'the value of the third key'

add

 {'details':  'third item of the second list'}

Create the structure

    s3: |
      {% for i in l1 %}
      {% set a=i.split(' ') %}
      - {{ a.1 }}: {{ a.2 }}
        {{ a.3 }}: {{ a.4 }}
        {{ a.5 }} {{ a.6 }}: {{ a.7 }}
      {% if a.7 == l2.1 %}
        details: {{ l2.2 }}
      {% endif %}
      {% endfor %}

gives

  s3: |-
  - bgp: x
    tags-vlan bgp: z
    vlan: y
  - bgp: x1
    tags-vlan bgp: z1
    vlan: y1
  - bgp: x2
    details: h
    tags-vlan bgp: j
    vlan: y2

Convert the string to yaml

  l3: "{{ s3|from_yaml }}"

gives the list of the dictionaries

  l3:
  - bgp: x
    tags-vlan bgp: z
    vlan: y
  - bgp: x1
    tags-vlan bgp: z1
    vlan: y1
  - bgp: x2
    details: h
    tags-vlan bgp: j
    vlan: y2

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

vars:

s1: |-
set bgp x vlan y tags-vlan bgp z,
set bgp x1 vlan y1 tags-vlan bgp z1,
set bgp x2 vlan y2 tags-vlan bgp j
s2: |-
f,
j,
h,
m

l1: "{{ s1|split('\n')|join()|split(',') }}"
l2: "{{ s2|split('\n')|join()|split(',') }}"
s3: |
{% for i in l1 %}
{% set a=i.split(' ') %}
- {{ a.1 }}: {{ a.2 }}
{{ a.3 }}: {{ a.4 }}
{{ a.5 }} {{ a.6 }}: {{ a.7 }}
{% if a.7 == l2.1 %}
details: {{ l2.2 }}
{% endif %}
{% endfor %}
l3: "{{ s3|from_yaml }}"

tasks:

- debug:
var: l1
- debug:
var: l2
- debug:
var: s3
- debug:
var: l3}

create ansible dict from two list with a condition

1 Answers1