old_contents: # coding=utf-8
  import six
  import django
  from django.db import models
  
  try:
      from django.urls import reverse
  except ImportError:
      from django.core.urlresolvers import reverse
  
  if django.VERSION >= (1, 10):
      from django.utils.deprecation import MiddlewareMixin
  else:
      MiddlewareMixin = object
  
  
  def get_rel_model(field):
      if django.VERSION >= (2, 0):
          return field.remote_field.model
  
      user_model = field.rel.to
      if isinstance(user_model, six.string_types):
          app_label, model_name = user_model.split('.')
          user_model = models.get_model(app_label, model_name)
      return user_model
  
  
  def get_request_port(request):
      if django.VERSION >= (1, 9):
          return request.get_port()
  
      host_parts = request.get_host().partition(':')
      return host_parts[2] or request.META['SERVER_PORT']
  
new_contents: # coding=utf-8
  import six
  import django
  from django.db import models
  
  
  try:
      from django.urls import reverse
  except ImportError:
      from django.core.urlresolvers import reverse
  
  try:
      from django.utils.deprecation import MiddlewareMixin
  except ImportError:
      MiddlewareMixin = object
  
  
  def get_rel_model(field):
      if django.VERSION >= (2, 0):
          return field.remote_field.model
  
      user_model = field.rel.to
      if isinstance(user_model, six.string_types):
          app_label, model_name = user_model.split('.')
          user_model = models.get_model(app_label, model_name)
      return user_model
  
  
  def get_request_port(request):
      if django.VERSION >= (1, 9):
          return request.get_port()
  
      host_parts = request.get_host().partition(':')
      return host_parts[2] or request.META['SERVER_PORT']
  
subject: Remove version check in favor of import error check