Request Help With Byte/String Problem

[Wildman]

For the purpose of learning I am writing a script that will
return different information about the Linux machine where
it is running.  Sort of like the inxi utility.

Below is some code that I found that returns a list of the
network interface devices on the system.  It runs as is
perfectly on Python2 but I get the error pasted below the
code when run on Python3, the desired version.  I know it
has something to do with bytes vs. strings but I can' seem
to figure it out.  Any help appreciated.

import array
import socket
import struct

def all_interfaces():
    max_possible = 128  # arbitrary. raise if needed.
    bytes = max_possible * 32
    s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
    names = array.array("B", '\0' * bytes)
    outbytes = struct.unpack('iL', fcntl.ioctl(
        s.fileno(),
        0x8912,  # SIOCGIFCONF
        struct.pack('iL', bytes, names.buffer_info()[0])
    ))[0]
    namestr = names.tostring()
    lst = []
    for i in range(0, outbytes, 40):
        name = namestr[i:i+16].split('\0', 1)[0]
        ip   = namestr[i+20:i+24]
        lst.append((name, ip))
    return lst

def format_ip(addr):
    return str(ord(addr[0])) + '.' + \
           str(ord(addr[1])) + '.' + \
           str(ord(addr[2])) + '.' + \
           str(ord(addr[3]))


ifs = all_interfaces()
for i in ifs:
    print("%12s   %s" % (i[0], format_ip(i[1])))


Traceback (most recent call last):
  File "./ifaces.py", line 32, in <module>
    ifs = all_interfaces()
  File "./ifaces.py", line 11, in all_interfaces
    names = array.array("B", '\0' * bytes)
TypeError: cannot use a str to initialize an array with typecode 'B'

-- 
<Wildman> GNU/Linux user #557453
The cow died so I don't need your bull!