Convert Unicode to String with Ansible and Jinja2 - ansible

Question

I need help with converting a Unicode variable to a string in order for the below Ansible construct to work.
In this particular case, I want to use the item.keys() method in order to get the current env name (i.e. uat) but I get [u'uat'] instead. I have been searching the Internet but could not find a way to convert [u'uat'] to a simple uat.
defaults/main.yml:
blablabla:
env:
- uat:
accounts:
- david:
email: david#example.com
- anna:
email: anna#example.com
- develop:
accounts:
- john:
email: john#example.com
tasks/main.yml:
- include_tasks: dosomething.yml
with_items:
- "{{ blablabla.env }}"
tasks/dosomething.yml:
- name: Get accounts
set_fact:
accounts: "{%- set tmp = [] -%}
{%- for account in item[item.keys()].accounts -%}
{{ tmp.append(account) }}
{%- endfor -%}
{{ tmp }}"
error message:
<?xml version="1.0" encoding="UTF-8"?>
<root>
<failed value="True"/>
<msg value="The task includes an option with an undefined variable. The error was: dict object has no element [u'uat']
The error appears to have been in 'dosomething.yml': line 9, column 3, but may
be elsewhere in the file depending on the exact syntax problem.
The offending line appears to be:
- name: Get accounts
^ here
exception type: <class 'ansible.errors.AnsibleUndefinedVariable'>
exception: dict object has no element [u'uat']"/>
</root>
Alternatively, I would also welcome alternative approaches, as long the data structure (i.e. the defaults/main.yml file) remains unchanged.

Answer 1

I get [u'uat']
This is not a "Unicode string", this is a list ― pay attention to [ ].
As item.keys() returns a list, but you want to use it as an index to item[], you must select the element. So either use first filter or [0]:
- name: Get accounts
set_fact:
accounts: "{%- set tmp = [] -%}
{%- for account in item[item.keys()|first].accounts -%}
{{ tmp.append(account) }}
{%- endfor -%}
{{ tmp }}"