dynamic ansible inventory

test.py

#!/usr/bin/python

import json
import sys

class foo:

    def __init__(self):
        self.json_inventory=[]

    def get_ci_list(self):
        # input --> file that lists ci machines --> return pyhton list of ci
        # snowtool -L 10 --linux
        with open('ci_list', "r") as f:
            return f.read().splitlines()

    #create json ansible group with passed arguments
    def create_group(self,hostname,ip=None, ansible_ssh_user='unixsvc'):
        if ip==None:
            ip=hostname

        result={}
        app_name = hostname
        result[app_name] = {}
        result[app_name]['hosts'] = []
        result[app_name]['hosts'].append(hostname)
        result[app_name]['vars'] = {}
        result[app_name]['vars']['ansible_ssh_user'] = ansible_ssh_user
        return str(result)[1:][:-1]


    def append_group(self,group):
        return self.json_inventory.append(group)

    def get_json_inventory(self):
        for item in self.get_ci_list():
            self.append_group(self.create_group(item))
        i = json.dumps( self.json_inventory,indent=4, separators=(',', ': '))[1:][:-1]
        i= '{'+i+'}'
        return i.replace('"','')


    def test(self):
        app_name ='35.153.120.42'
        result={}
        result[app_name] = {}
        result[app_name]['hosts'] = []
        result[app_name]['hosts'].append('35.153.120.42')
        result[app_name]['vars'] = {}
        result[app_name]['vars']['ansible_ssh_user'] = 'bitnami'
        print  json.dumps( result,indent=4, separators=(',', ': '))



def main():
    obj = foo()
    print  (obj.get_json_inventory())


if __name__ == "__main__":
    if len(sys.argv) == 2 and sys.argv[1] == '--list':
        main()
    elif len(sys.argv) == 3 and sys.argv[1] == '--host':
        print(json.dumps({}))
    else:
        print("Need an argument, either --list or --host <host>")