'Prints help for a specific action.
Args:
action: If provided, print help for the action provided.
Expects self.args[0], or \'action\', to contain the name of the action in
question.  Exits the program after printing the help message.'

def Help(self, action=None):

    if (not action):
        if (len(self.args) > 1):
            self.args = ['    '.join(self.args)]
        if ((len(self.args) != 1) or (self.args[0] not in self.actions)):
            self.parser.error(('Expected    a    single    action    argument.        Must    be    one    of:\n' + self._GetActionDescriptions()))
        action = self.args[0]
    action = self.actions[action]
    (self.parser, unused_options) = self._MakeSpecificParser(action)
    self._PrintHelpAndExit(exit_code=0)
