repeat

Функция repeat возвращает итератор, который повторяет указанный объект бесконечно или указанное количество раз:

itertools.repeat(object[, times])

Пример использования repeat для повторения команды:

from itertools import repeat
from concurrent.futures import ThreadPoolExecutor

import netmiko
import yaml


def send_show(device, show):
    with netmiko.ConnectHandler(**device) as ssh:
        ssh.enable()
        result = ssh.send_command(show)
        return result


with open('devices.yaml') as f:
    devices = yaml.safe_load(f)

with ThreadPoolExecutor(max_workers=3) as executor:
    result = executor.map(send_show, devices, repeat('sh clock'))
    for device, output in zip(devices, result):
        print(device['ip'], output)