$ python3 -c 'from cloudinit import net; print(net.generate_fallback_config())'
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/home/smoser-public/src/cloud-init/net-fallback/cloudinit/net/__init__.py", line 349, in generate_fallback_config
    key=lambda x: int(x.strip(string.ascii_letters)))
  File "/home/smoser-public/src/cloud-init/net-fallback/cloudinit/net/__init__.py", line 349, in <lambda>
    key=lambda x: int(x.strip(string.ascii_letters)))
ValueError: invalid literal for int() with base 10: '0s25'