Ansible: Trying to parse out Loopback0 IP Address - ansible

Question

I am trying to store the IP address of my loopback0 as variable. I can call the ipv4 information, but it doesn't let me call the address information. [Scrubbed Info for Privacy]
Code:
- name: Configure IPSLA on Americas Router
gather_facts: false
hosts: IP_SLA
connection: local
serial: 1
tasks:
- name: Gather Switch Info
ios_facts:
- name: Debug
debug:
var: ansible_facts["net_interfaces"]["Loopback0"]["ipv4"]
...
Output:
PLAY [Configure IPSLA on Americas Router] ***************************************************************************************************************************************************************************************************
TASK [Gather Switch Info] *******************************************************************************************************************************************************************************************************************
ok: [host] => {"ansible_facts": {"ansible_net_interfaces": {"Loopback0": {"bandwidth": 8000000, "description": null, "duplex": null, "ipv4": [{"address": "10.x.x.x", "subnet": "32"}], "lineprotocol": "up ", "macaddress": null, "mediatype": null, "mtu": 1514, "operstatus": "up", "type": null}
TASK [Debug] ********************************************************************************************************************************************************************************************************************************
ok: [host] => {
"ansible_facts[\"net_interfaces\"][\"Loopback0\"][\"ipv4\"]": [
{
"address": "10.x.x.x",
"subnet": "32"
}
]
}
But when I try and call the address:
- name: Debug
debug:
var: ansible_facts["net_interfaces"]["Loopback0"]["ipv4"]["address"]
I end up with this error:
TASK [Debug] ****************************************************************************************************************************************
ok: [host] => {
"ansible_facts[\"net_interfaces\"][\"Loopback0\"][\"ipv4\"][\"address\"]": "VARIABLE IS NOT DEFINED!: 'list object' has no attribute 'address'"
How do I get the address stored as a variable so I can use it in future tasks?

Answer 1

The square brackets in:
ok: [host] => {
"ansible_facts[\"net_interfaces\"][\"Loopback0\"][\"ipv4\"]": [
{
"address": "10.x.x.x",
"subnet": "32"
}
]
}
Indicate this ["net_interfaces"]["Loopback0"]["ipv4"] is an array with a single element.
Use [0] to indicate the first element of the array, as demonstrated by the following code:
ansible_facts["net_interfaces"]["Loopback0"]["ipv4"][0]["address"]