parameters: (self, key)
return_statement: return self.fields[key].list_value
docstring: Returns a list for this key, creating if it didn't exist already.
docstring_summary: Returns a list for this key, creating if it didn't exist already.
docstring_tokens: Returns a list for this key creating if it didn t exist already .
function: def get_or_create_list(self, key):
      """Returns a list for this key, creating if it didn't exist already."""
      return self.fields[key].list_value
function_tokens: def get_or_create_list ( self , key ) : return self . fields [ key ] . list_value