Search for rpis based on name, ssh to first hit; assumes 'eth' is the var that controls which interface to check arp of

findpi.py

#!/usr/bin/env python3

# imports
import netifaces
import os
import subprocess


def main():
    eth = 'en9'
    validSearchResults="pi\|air"
    useUser="pi"

    print('Looking for Raspberries...')
    # cmd line args are in sys.argv[1], sys.argv[2] ...
    # sys.argv[0] is the script name itself and can be ignored
    bcaddr = netifaces.ifaddresses(eth)[2][0]['broadcast']
    cmd = "/usr/sbin/arp -i " + eth + " -a | grep -e '" + validSearchResults + "' | grep -v 'incomplete'"
    os.system("/sbin/ping -c 1 " + bcaddr + "> /dev/null")
    try:
        cmdoutput = subprocess.check_output(cmd, shell=True)
    except:
        print("Oops! None caught!")
        exit
    else:
        arpline = cmdoutput.decode("utf-8")
        targetraspberry = arpline[arpline.find("(") + 1:arpline.find(")")]
        print("Trying " + targetraspberry)
        os.system("/usr/bin/ssh " + useUser + "@" + targetraspberry)


if __name__ == '__main__':
    main()