How can I parse a text file?

[Mike Ru]

Thank you very much!

Here you see that I have just coded  

def command_save(command):
   var = subprocess.check_output(command.split(), universal_newlines=True)
   output = open('scanning.txt', 'w')
   print(var, file=output)
   output.close()

def scannig():
   var = subprocess.check_output(['sudo', 'iwlist', 'scanning'], universal_newlines=True)
   output = open('scanning.txt', 'w')
   print(var, file=output)
   output.close()

address = []
channel = []
essid = []
f = open('scanning.txt', 'r').readlines()
for x in f:
   if "Address" in x:
       address.append(x)


for x in f:
   if "Channel" in x:
       channel.append(x)

for x in f:
   if "ESSID" in x:
       essid.append(x)

address = ''.join(address)
channel = ''.join(channel)
essid = ''.join(essid)

address = address.split()
channel = channel.split()
essid = essid.split()

Now I cannot join address, channel, essid together them.