Am I connected to a vpn right now? (for conky)

vpn_check.py

#!/usr/bin/python3
# am i connected to a vpn? (using nmcli)
import subprocess
vpnd = bool()
for l in subprocess.Popen(["nmcli", "-t", "--fields", "name,vpn", "c", "status"], stdout=subprocess.PIPE, stderr=subprocess.STDOUT).communicate()[0].decode("utf-8").split("\n"):
    if len(l) > 0:
        a, b = l.split(":")
        if b == "yes":
            print(''+a+'', end="", flush=True)
            vpnd = True
            break
if not vpnd:
    print(''+"None"+'', end="", flush=True)