parse_eos.py

from getpass import getpass
from netmiko import ConnectHandler

# Prompt for device credentials
uname = input('Username: ')
pword = getpass()

command = "show version"

# collect devices that will be configured
hosts = []  # create list object
with open('hosts.txt', 'r') as hFile:
  for line in hFile:
    hosts.append(line.strip())

# cycle through each device sequentially and run the command
for h in hosts:
  device = {
    "device_type": "arista_eos",
    "host": h,
    "username": uname,
    "password": pword,
    "session_log": h + ".log",
  }
  # Connect and send command
  with ConnectHandler(**device) as conn:
    output = conn.send_command(command, use_textfsm=True)
  for o in output:
    print(h + ' has an uptime of ' + o['uptime'])