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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def set_ifo_tag(self,ifo_tag,pass_to_command_line=True):
 """ Set the ifo tag that is passed to the analysis code. @param ifo_tag: a string to identify one or more IFOs @bool pass_to_command_line: add ifo-tag as a variable option. """

    self.__ifo_tag = ifo_tag
    if pass_to_command_line:
      self.add_var_opt('ifo-tag', ifo_tag)