import netifaces as ni
ip = ni.ifaddresses("eth0")[ni.AF_INET]['addr']
error
ip = ni.ifaddresses("eth0")[ni.AF_INET]['addr'] ValueError: You must specify a valid interface name.
ip = ni.ifaddresses("en0")[ni.AF_INET]['addr']
error
ip = ni.ifaddresses("en0")[ni.AF_INET]['addr'] TypeError: list indices must be integers or slices, not str
Does anyone know why the mac is giving such errors?
The first error means that there is no interface named eth0. Indeed, this is a common interface name on Linux, but not on MacOS.
The second error means that you are trying to extract a field which doesn't exist. There is information about en0 but it is an array, not a dict. This is like saying "hello"["addr"], there is no way to access the "addr":th element of a sequence. You apparently mean something like
ip = ni.ifaddresses("en0")[ni.AF_INET][0]['addr']
though there is no way out of context to tell whether getting only one address is actually what you want. The array you get represents a number of bindings; perhaps you want all of them?
addrs = ni.ifaddresses('en0')
ips = [x['addr'] for x in addrs[ni.AF_INET]]
The netifaces documentation actually explains this in quite some detail.