old_contents: import os
  import re
  import importlib
  from netaddr import mac_unix, mac_eui48
  
  MAC_ADDR_REGEX = r'^([0-9A-Fa-f]{1,2}[:-]){5}([0-9A-Fa-f]{1,2})$'
  
  IP_ADDR_REGEX = r'^(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.' \
                  r'(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.' \
                  r'(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.' \
                  r'(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$'
  
  
  class mac_linux(mac_unix):
      """MAC format with zero-padded all upper-case hex and colon separated"""
      word_fmt = '%x'
  
  
  def default_dialect(*args):
      return mac_linux
  
  
  def format_mac(eui_obj, dialect):
      # Format a EUI instance as a string using the supplied dialect class, allowing custom string classes by
      # passing directly or as a string, a la 'module.dialect_cls', where 'module' is the module and 'dialect_cls'
      # is the class name of the custom dialect. The dialect must either be defined or imported by the module's __init__.py if
      # the module is a package.
      if not isinstance(dialect, mac_eui48):
          if isinstance(dialect, str):
              module, dialect_cls = dialect.split('.')
              dialect = getattr(importlib.import_module(module), dialect_cls)
      eui_obj.dialect = dialect
      return str(eui_obj)
  
  
  from pkg_resources import get_distribution, DistributionNotFound
  
  try:
      _dist = get_distribution('django-macaddress')
  except DistributionNotFound:
      __version__ = 'Please install this project with setup.py'
  else:
      __version__ = _dist.version
  VERSION = __version__  # synonym
  default_app_config = 'abonapp.apps.AbonappConfig'
  
  
  def ping(ip_addr: str, count=1):
      if re.match(IP_ADDR_REGEX, ip_addr):
          response = os.system("`which ping` -4Anq -c%d -W1 %s > /dev/null" % (count, ip_addr))
          return True if response == 0 else False
      else:
          return False
  
new_contents: import os
  import re
  import importlib
  
  from django.shortcuts import _get_queryset
  from netaddr import mac_unix, mac_eui48
  
  MAC_ADDR_REGEX = r'^([0-9A-Fa-f]{1,2}[:-]){5}([0-9A-Fa-f]{1,2})$'
  
  IP_ADDR_REGEX = r'^(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.' \
                  r'(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.' \
                  r'(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.' \
                  r'(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$'
  
  
  class mac_linux(mac_unix):
      """MAC format with zero-padded all upper-case hex and colon separated"""
      word_fmt = '%x'
  
  
  def default_dialect(*args):
      return mac_linux
  
  
  def format_mac(eui_obj, dialect):
      # Format a EUI instance as a string using the supplied dialect class, allowing custom string classes by
      # passing directly or as a string, a la 'module.dialect_cls', where 'module' is the module and 'dialect_cls'
      # is the class name of the custom dialect. The dialect must either be defined or imported by the module's __init__.py if
      # the module is a package.
      if not isinstance(dialect, mac_eui48):
          if isinstance(dialect, str):
              module, dialect_cls = dialect.split('.')
              dialect = getattr(importlib.import_module(module), dialect_cls)
      eui_obj.dialect = dialect
      return str(eui_obj)
  
  
  from pkg_resources import get_distribution, DistributionNotFound
  
  try:
      _dist = get_distribution('django-macaddress')
  except DistributionNotFound:
      __version__ = 'Please install this project with setup.py'
  else:
      __version__ = _dist.version
  VERSION = __version__  # synonym
  default_app_config = 'abonapp.apps.AbonappConfig'
  
  
  def ping(ip_addr: str, count=1):
      if re.match(IP_ADDR_REGEX, ip_addr):
          response = os.system("`which ping` -4Anq -c%d -W1 %s > /dev/null" % (count, ip_addr))
          return True if response == 0 else False
      else:
          return False
  
  
  def get_object_or_None(klass, *args, **kwargs):
      queryset = _get_queryset(klass)
      try:
          return queryset.get(*args, **kwargs)
      except AttributeError:
          klass__name = klass.__name__ if isinstance(klass, type) else klass.__class__.__name__
          raise ValueError(
              "First argument to get_object_or_404() must be a Model, Manager, "
              "or QuerySet, not '%s'." % klass__name
          )
      except queryset.model.DoesNotExist:
          return
  
subject: create func get_object_or_None in djing