Extract info about a single access point from iw scan output

iwextract.py

#!/usr/bin/env python3
import subprocess
import sys
import re

BSS_PATTERN = re.compile(r'BSS (\S+)( )?\(on \w+\)')

if __name__ == '__main__':
    if len(sys.argv) != 3:
        print(f"Usage: {sys.argv[0]} <interface> <bssid>")
        exit(1)

    interface = sys.argv[1]
    bssid = sys.argv[2].lower()

    cmd = 'iw dev {} scan'.format(interface)
    proc = subprocess.run(cmd, shell=True, stdout=subprocess.PIPE,
                          stderr=subprocess.STDOUT, encoding='utf-8', errors='ignore')

    lines = proc.stdout.splitlines()
    result = ""
    current_bssid = ""
    for line in lines:
        match = re.match(BSS_PATTERN, line)
        if match:
            current_bssid = match.group(1)
        if current_bssid == bssid:
            result += line + '\n'

    result = result[:-1]   # Skip last newline
    if result:
        print(result)
    else:
        print("No results")