{% set items_0 = { 'apple': 'fruit', 'orange': 'fruit1', 'peugeot': 'nown' } %}
{% set arr = {} %}
{% for key,value in items_0 %}
{# {{ key ~ ":" ~ value }} #}
{% set arr = arr|merge({ (key) : value }) %}
{{ arr[key] }}
{% endfor %}
=============
{% for key,value in arr %}
{{ key ~ ":" ~ value }}
{% endfor %}
===============
http://twig.sensiolabs.org/doc/filters/merge.html