Not able to read/print the csv file data - ansible

Question

Running the below playbook and trying to print the value of that task. It fails with below error.
FAILED! => {"msg": "The task includes an option with an undefined variable. The error was: 'list object' has no attribute 'name'\n\nThe error appears to be in '/Users/srikanth.venugopalan/ansible/roles/rmi_staging/tasks/main.yml': line 9, column 4, but may\nbe elsewhere in the file depending on the exact syntax problem.\n\nThe offending line appears to be:\n\n register: topics\n - debug:\n ^ here\n"
The code is
- name: Login to cluster
shell: /home/srikanth/ls.sh
- name: Read the CSV file
read_csv:
path: /home/srikanth/template1.csv
register: topics
- debug:
msg: 'Name {{ topics.list.name }}'
I have tried below as well, but no luck
- name: Login to cluster
shell: /home/srikanth/ls.sh
- name: Read the CSV file
read_csv:
path: /home/srikanth/template1.csv
register: topics
- debug:
msg: 'Name {{ topics.list.1.name }}'
CSV file format as per below
name,replica,partition
test-topic,3,3
I have gone through the link https://stackoverflow.com/questions/53799730/how-to-read-csv-file-data-in-ansible-playbook-using-with-lines, but one thing dont know in the debug how it come user.username.
Please guide me.
Actual goal is to take name alone from the debug output.

Answer 1

Your .1.name attempt didn't work because topics.list is, like all list data structures in python, 0-indexed
You can observe the behavior for yourself, as the comments asked you to:
tasks:
- copy:
dest: ./template1.csv
content: |
name,replica,partition
test-topic,3,3
- read_csv:
path: ./template1.csv
register: topics
- debug:
var: topics
- debug:
msg: 'Name {{ topics.list.0.name }}'
emits
ok: [localhost] => {
"topics": {
"changed": false,
"dict": {},
"failed": false,
"list": [
{
"name": "test-topic",
"partition": "3",
"replica": "3"
}
]
}
}
ok: [localhost] => {
"msg": "Name test-topic"
}