detect_ethernet_and_wireless_adapter_in_linux.py

#!/usr/bin/env python3
# While systemd has the prefixes set in the following way:
# en = ethernet
# wl = wlan
# ww = wwan
# There are still instances where an interface won't have these.
# Which, is why I made this script.
import os

ethernet_interfaces = []
wireless_interfaces = []


def get_interfaces():
    interfaces = os.listdir('/sys/class/net')
    return interfaces

def detect_virtual_interfaces(interfaces):
    for each in interfaces:
        real_path = os.path.realpath(os.path.join('/sys/class/net/', each))
        if '/devices/virtual/net/' in real_path:
            interfaces.remove(each)
    return interfaces

def detect_ethernet(clean_interfaces):
    for each in clean_interfaces:
        try:
            with open('/sys/class/net/{0}/speed'.format(each), 'r') as speed_file:
                for line in speed_file:
                    ethernet_interfaces.append(each)
        except OSError:
            pass

def detect_wireless(clean_interfaces):
    for each in clean_interfaces:
        if os.path.isdir('/sys/class/net/{0}/wireless'.format(each)):
            wireless_interfaces.append(each)


if __name__ == '__main__':
    interfaces = get_interfaces()

    clean_interfaces = detect_virtual_interfaces(interfaces)

    detect_ethernet(clean_interfaces)
    if not ethernet_interfaces:
        print('No ethernet detected!')
    else:
        print('Ethernet:', ', '.join(ethernet_interfaces))

    detect_wireless(clean_interfaces)
    if not wireless_interfaces:
        print('No wireless detected!')
    else:
        print('Wireless:', ', '.join(wireless_interfaces))