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Python 2 is not there. If you run on AWS, either have a task to download and install Python 2, or in your EC2's user data to install Python 2 (this is necessary for Ansible users).

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Ironic since Ansible's lack of Python 3 support was due to vociferous insistence by key Ansible developers that it would be wrong even to allow the use of Ansible with Python 3 as long as popular CentOS versions did not have it.

I have to read it backward. Ansible is now part of RedHat. CentOS doesn't have Python 3, and some key Ansible developers have strong opinion on Ansible not supporting Python 3 in the near future. Am I reading it right?

Ansible has preliminary py3 support now. It works well enough for me on Ubuntu 16, only py3 installed.

Which version?

I think the bigger reason was Ansible needed to support Python 2.4 and 2.5 for old CentOS versions, making simultaneous Python 3 support very hard. They've now dropped 2.4 and 2.5, thus allowing Python 3 compatibility.

https://github.com/ansible/ansible/pull/22721/files

(Though, it's worth noting that CentOS still does not have Python 3 support out of the box.)

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