Quick Tips on Making Your Code Python 3 Ready

Nice article on tips for making the python2 code to be python 3 ready
http://stackful-dev.com/quick-tips-on-making-your-code-python-3-ready.html

How to execute task on subset of hosts - Ansible

Host file

[root@tiber ~]# cat hosts.yml
[nodes]
tiber
po
docker

I want to run task on 2ND & 3RD HOSTS only.

[root@tiber ~]# cat play.yml

- hosts: all

  tasks:

   - shell: "hostname"

     when: inventory_hostname != play_hosts[0]

[root@tiber ~]# ansible-playbook -i hosts.yml play.yml

 [WARNING]: The version of gmp you have installed has a known issue regarding

timing vulnerabilities when used with pycrypto. If possible, you should update

it (ie. yum update gmp).

PLAY [all] ********************************************************************

GATHERING FACTS ***************************************************************

ok: [docker]

ok: [tiber]

ok: [po]

TASK: [shell hostname] ********************************************************

skipping: [tiber]

changed: [docker]

changed: [po]

PLAY RECAP ********************************************************************

docker                     : ok=2    changed=1    unreachable=0    failed=0

po                         : ok=2    changed=1    unreachable=0    failed=0

tiber                      : ok=1    changed=0    unreachable=0    failed=0