code: def addOptionString(self, name, value, append=False):
          
          return self.options.AddOptionString(
              str_to_cppstr(name), str_to_cppstr(value), append)
docs: .. _addOptionString:
  
          Add a string option.
  
          :param name: The name of the option.  Option names are case insensitive and must be unique.
          :type name: str
          :param value: The value of the option.
          :type value: str
          :param append: Setting append to true will cause values read from the command line
           or XML file to be concatenated into a comma delimited set.  If _append is false,
           newer values will overwrite older ones.
          :type append: boolean
          :return: The result of the operation.
          :rtype: bool
  
          :see: addOption_, addOptionBool_, addOptionInt_