old_contents: """
  Utility functions available to all SigmaPi templates.
  """
  
  from django import template
  
  from ..utils import get_full_name_or_deleted
  
  
  register = template.Library()
  
  
  @register.filter
  def full_name(model, user_field_name):
      """
      Safely get the full name of user field on a model.
  
      Arguments:
          model (django.models.Model)
          user_field_name (str): Name of user field on model
  
      Returns: str
          Either the full name, or '[deleted]' if the user is None
          or not a field on model.
      """
      return get_full_name_or_deleted(
          getattr(model, user_field_name, None)
      )
  
  
  @register.filter
  def lookup(dictionary, key):
      """
      Lookup a key in a dictionary or list.
  
      Arguments:
          dictionary (dict|list)
          key (str|int)
  
      Returns: object
      """
      return dictionary[key]
  
  
  @register.filter
  def prepend(str1, str2):
      """
      Prepend the second string on the first.
  
      Arguments:
          str1 (str)
          str2 (str)
  
      Returns: str
      """
      return str2 + str1
  
new_contents: """
  Utility functions available to all SigmaPi templates.
  """
  
  from django import template
  
  from ..utils import get_full_name_or_deleted
  
  
  register = template.Library()
  
  
  @register.filter
  def full_name(model, user_field_name):
      """
      Safely get the full name of user field on a model.
  
      Arguments:
          model (django.models.Model)
          user_field_name (str): Name of user field on model
  
      Returns: str
          Either the full name, or '[deleted]' if the user is None
          or not a field on model.
      """
      return get_full_name_or_deleted(
          getattr(model, user_field_name, None)
      )
  
  
  @register.filter
  def lookup(collection, key):
      """
      Lookup a key in a dictionary or list.
  
      Returns None if dictionary is None or key is not found.
  
      Arguments:
          dictionary (dict|list)
          key (str|int)
  
      Returns: object
      """
      if collection:
          try:
              return collection[key]
          except (KeyError, IndexError):
              return None
      else:
          return None
  
  
  @register.filter
  def prepend(str1, str2):
      """
      Prepend the second string on the first.
  
      Arguments:
          str1 (str)
          str2 (str)
  
      Returns: str
      """
      return str2 + str1
  
subject: Fix 403 page