title: socket.gaierror: [Errno -2] Name or service not known with Python3
body: <p>I am trying to use port scanner program.</p>
  
  <pre><code>import socket
  import subprocess
  import sys
  from datetime import datetime
  
  subprocess.call('clear', shell=True)
  
  remoteServer    = input("Enter a remote host to scan: ")
  remoteServerIP  = socket.gethostbyname(remoteServer)
  
  print( "-" * 60)
  print( "Please wait, scanning remote host", remoteServerIP)
  print( "-" * 60)
  
  t1 = datetime.now()
  
  try:
      for port in range(1,1025):  
          sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
          result = sock.connect_ex((remoteServerIP, port))
          if result == 0:
              print( "Port {}:     Open".format(port))
          sock.close()
  
  except KeyboardInterrupt:
      print( "You pressed Ctrl+C")
      sys.exit()
  
  except socket.gaierror:
      print( 'Hostname could not be resolved. Exiting')
      sys.exit()
  
  except socket.error:
      print( "Couldn't connect to server")
      sys.exit()
  
  t2 = datetime.now()
  total =  t2 - t1
  print( 'Scanning Completed in: ', total)
  </code></pre>
  
  <p>But it is not working.</p>
  
  <pre><code>Enter a remote host to scan: http://www.osjajinci.com/
  Traceback (most recent call last):
    File "portscanner.py", line 12, in &lt;module&gt;
      remoteServerIP  = socket.gethostbyname(remoteServer)
  socket.gaierror: [Errno -2] Name or service not known
  </code></pre>
  
  <p>I am trying to learn more about the sockets,I am begginer.I have double checked the Python3 code and could not find any mistakes.</p>