old_contents: # encoding: utf-8
  
  """
  .. codeauthor:: Tsuyoshi Hombashi <gogogo.vm@gmail.com>
  """
  
  from __future__ import absolute_import
  
  import dataproperty
  import six
  
  from ._error import NetworkInterfaceNotFoundError
  
  
  def verify_network_interface(device):
      try:
          import netifaces
      except ImportError:
          return
  
      if device not in netifaces.interfaces():
          raise NetworkInterfaceNotFoundError(
              "network interface not found: " + device)
  
  
  def sanitize_network(network):
      """
      :return: Network string
      :rtype: str
      :raises ValueError: if the network string is invalid.
      """
  
      import ipaddress
  
      if dataproperty.is_empty_string(network):
          return ""
  
      try:
          ipaddress.IPv4Address(six.u(network))
          return network + "/32"
      except ipaddress.AddressValueError:
          pass
  
      ipaddress.IPv4Network(six.u(network))  # validate network str
  
      return network
  
new_contents: # encoding: utf-8
  
  """
  .. codeauthor:: Tsuyoshi Hombashi <gogogo.vm@gmail.com>
  """
  
  from __future__ import absolute_import
  
  import dataproperty
  import six
  
  from ._error import NetworkInterfaceNotFoundError
  
  
  def verify_network_interface(device):
      try:
          import netifaces
      except ImportError:
          return
  
      if device not in netifaces.interfaces():
          raise NetworkInterfaceNotFoundError(
              "network interface not found: " + device)
  
  
  def sanitize_network(network):
      """
      :return: Network string
      :rtype: str
      :raises ValueError: if the network string is invalid.
      """
  
      import ipaddress
  
      if dataproperty.is_empty_string(network):
          return ""
  
      if network == "anywhere":
          return "0.0.0.0/0"
  
      try:
          ipaddress.IPv4Address(six.u(network))
          return network + "/32"
      except ipaddress.AddressValueError:
          pass
  
      ipaddress.IPv4Network(six.u(network))  # validate network str
  
      return network
  
subject: Add special case for "anywhere"