1461   7950  001f.ce5d.cb4d  Gi0/0/1.10               1  Vi2.504    PTA
   1441  36472  dc9f.db01.c6cb  Gi0/0/1.10               1  Vi2.502    PTA
   1370   7922  c83a.350d.f368  Gi0/0/1.10               1  Vi2.467    PTA
    768   7910  c46e.1f7a.4763  Gi0/0/1.10               1  Vi2.451    PTA
   1539   7614  dc9f.db01.c6e8  Gi0/0/1.10               1  Vi2.19     PTA

7950  00:1F:CE:5D:CB:4D  Gi0/0/1.10
36472 DC:9F:DB:01:C6:CB  Gi0/0/1.10
7922  C8:3A:35:0D:F3:68  Gi0/0/1.10
7910  C4:6E:1F:7A:47:63  Gi0/0/1.10
7614  DC:9F:DB:01:C6:CB  Gi0/0/1.10

import telnetlib

HOST = '192.168.1.1'
password = "veryverysecure_password"
user = "veryveryandroid"

tn = telnetlib.Telnet(HOST)
tn.read_until(b"Username: ")
tn.write(user.encode('ascii') + b"n")
tn.read_until(b"Password: ")
tn.write(password.encode('ascii') + b"n")
tn.write(b"term len 0 n")
tn.write(b"show pppoe session | exclude 7878.8787.6969 n")

tn.write(b"n exitn")

mystring = tn.read_all().decode('ascii').replace('rn', 'n')
#print(mystring)
temp_list = mystring.splitlines()
#print(temp_list)
sub = 'PTA'
sub2 = 'Vi2'
print ("n".join(s for s in temp_list if sub in s and sub2 in s))