Wildman via Python-list <python-list@python.org> writes:
> def get_ip_address(ifname):
> s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
> return socket.inet_ntoa(fcntl.ioctl(
> s.fileno(),
> 0x8915, # SIOCGIFADDR
> struct.pack('256s', ifname[:15])
> )[20:24])
> print(get_ip_address("eth0"))
> print(get_ip_address("lo"))
In Python 3, the literal ‘"eth0"’ creates a text (‘unicode’) object.
Python 3 correctly implements text as Unicode, which has no particular
representation as bytes.
You then pass that object to ‘struct.pack('256s', …)’, which (as the
error says) expects a ‘bytes’ object. A text object is incompatible with
that expectation.
If you want a sequence of bytes, perhaps you want to encode the text, to
some specified encoding. Maybe ASCII:
struct.pack('256s', ifname.encode('ascii'))
That may be different from what you want the code to do, though. It's
not clear from the code what its intention is.
--
\ “What is needed is not the will to believe but the will to find |
`\ out, which is the exact opposite.” —Bertrand Russell, _Free |
_o__) Thought and Official Propaganda_, 1928 |
Ben Finney
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