Worktory is a python library created with the single purpose of simplifying the inventory management of network automation scripts.

$ pip install worktory

devices = [
            {
            'name': 'sandbox-iosxr-1',
            'hostname': 'sandbox-iosxr-1.cisco.com',
            'platform': 'cisco_iosxr',
            'username': 'admin',
            'password': 'C1sco12345',
            'groups': ['CORE'],
            'connection_manager': 'scrapli',
            'select_parsers' : 'genie',
            'mode': 'async',
            'transport': 'asyncssh',
            },
            {
            'name': 'sandbox-nxos-1',
            'hostname': 'sandbox-nxos-1.cisco.com',
            'platform': 'cisco_nxos',
            'username': 'admin',
            'password': 'Admin_1234!',
            'groups': ['CORE'],
            'select_parsers' : 'ntc',
            'connection_manager': 'scrapli',
            'mode': 'async',
            'transport': 'asyncssh'
            },
            {
            'name': 'sandbox-nxos-2',
            'hostname': 'sandbox-nxos-1.cisco.com',
            'platform': 'nxos',
            'username': 'admin',
            'password': 'Admin_1234!',
            'groups': ['EDGE'],
            'connection_manager': 'unicon',
            'mode': 'sync',
            'transport': 'ssh',
            'GRACEFUL_DISCONNECT_WAIT_SEC': 0,
            'POST_DISCONNECT_WAIT_SEC': 0,
            },
            {
            'name': 'sandbox-iosxr-2',
            'hostname': 'sandbox-iosxr-1.cisco.com',
            'platform': 'cisco_iosxr',
            'username': 'admin',
            'password': 'C1sco12345',
            'groups': ['CORE'],
            'connection_manager': 'scrapli',
            'select_parsers' : 'genie',
            'mode': 'sync',
            },
        ]

from worktory import InventoryManager
import asyncio
inventory = InventoryManager(devices)

device_configs = {}
async def get_config(device):
    await device.connect()
    config = await device.execute("show running-config")
    device_configs[device.name] = config
    await device.disconnect()

async def async_main():
    coros = [get_config(device) for device in inventory.filter(mode='async')]
    await asyncio.gather(*coros)

loop = asyncio.get_event_loop()
loop.run_until_complete(async_main())

from worktory import InventoryManager
from multiprocessing import Pool
inventory = InventoryManager(devices)

def get_config(device_name):
    inventory = InventoryManager(devices)
    device = inventory.devices[device_name]
    device.connect()
    config = device.execute("show running-config")
    device.disconnect()
    return ( device.name , config )

def main():
    devs = [device.name for device in inventory.filter(mode='sync')]
    with Pool(2) as p:
        return p.map(get_config, devs)


output = main()