As a long time puppet user, I started forcing myself to use ansible for my homelab so I can learn it's intricacies and limitations.

Recently I had a use-case where I wanted to re-use some data from a defined variable (list of objects) in a second module, but the format had to be different. In python I would have done something like new_var=[{a:i['a'], b:i['b']} for i in old_var], but apparently that is impossible in ansible. The best solution I was able to find after lots of searching was to to pass new_var to a jinja2 template which would render new_var as text, then run that through a json interpreter and set that as new_var. Absolutely rediculous.

It astounds me that a tool BUILT on python lacks any semblance of python's biggest feature, list comprehension.