old_contents: from .KEYNOTFOUND import KEYNOTFOUNDIN1
  from .dict_diff import dict_diff
  
  def get_old_dict_values(old, new):
  	# Returns the "old" value for two dicts.
  	diff = dict_diff(old, new)
  
  	return {key: diff[key][0] if diff[key][0] != KEYNOTFOUNDIN1 else None for key in diff}
  
new_contents: from .KEYNOTFOUND import KEYNOTFOUNDIN1
  from .dict_diff import dict_diff
  
  def get_old_dict_values(old, new):
  	# Returns the "old" value for two dicts.
  	diff = dict_diff(old, new)
  
  	return {key: diff[key][0]
  		if diff[key][0] != KEYNOTFOUNDIN1
  		else None
  		for key in diff}
  
subject: Expand an object comprehension onto several lines