old_contents: import socket
  
  
  def get_ip():
    """Get primary IP (the one with a default route) of local machine.
  
    This works on both Linux and Windows platforms, and doesn't require working
    internet connection.
    """
  
    s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
    try:
      # doesn't even have to be reachable
      s.connect(('10.255.255.255', 1))
      return s.getsockname()[0]
    except:
      return '127.0.0.1'
    finally:
      s.close()
  
new_contents: # Copyright 2018 Flight Lab authors.
  #
  # Licensed under the Apache License, Version 2.0 (the "License");
  # you may not use this file except in compliance with the License.
  # You may obtain a copy of the License at
  #
  #    https://www.apache.org/licenses/LICENSE-2.0
  #
  # Unless required by applicable law or agreed to in writing, software
  # distributed under the License is distributed on an "AS IS" BASIS,
  # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  # See the License for the specific language governing permissions and
  # limitations under the License.
  """Library for network related helpers."""
  
  import socket
  
  
  def get_ip():
    """Get primary IP (the one with a default route) of local machine.
  
    This works on both Linux and Windows platforms, and doesn't require working
    internet connection.
    """
  
    s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
    try:
      # doesn't even have to be reachable
      s.connect(('10.255.255.255', 1))
      return s.getsockname()[0]
    except:
      return '127.0.0.1'
    finally:
      s.close()
  
subject: add copyright header to net.py