Ansible - Define Inventory at run time

Question

I am liitle new to ansible so bear with me if my questions are a bit basic.

Scenario:

I have a few group of Remote hosts such as [EPCs] [Clients] and [Testers] I

Answer 1

I don't think you can define an inventory at run time. One thing you can do is, write a wrapper script over Ansible which will first prompt user for the hosts and then dynamically structure an ansible-playbook command.

I would prefer doing this using python, but you can use any language of your choice.

$ cat ansible_wrapper.py 
import ConfigParser
import os

nodes = ''
inv = {}

hosts =  raw_input("Enter hosts: ")
hosts = hosts.split(",")

config = ConfigParser.ConfigParser(allow_no_value=True)
config.readfp(open('hosts'))
sections = config.sections()

for i in range(len(sections)):
    inv[sections[i]] = hosts[i]


for key, value in inv.items():
    for i in range(int(value)):
        nodes = nodes + config.items(key)[i][0] + ";"


command = 'ansible-playbook -i hosts myplaybook.yml -e "nodes=%s"' % (nodes)
print "Running command: ", command
os.system(command)

Note: I've tried running this script only using python2.7