code: def _make_forecast_options(forecast_periods):
      if forecast_periods is None:
          return ""
      forecast_spec = "forecast{\n"
      forecast_spec += f"maxlead = ({forecast_periods})\n}}\n"
      return forecast_spec
  
imports: from statsmodels.compat.pandas import deprecate_kwarg
  import os
  import subprocess
  import tempfile
  import re
  from warnings import warn
  import pandas
  from statsmodels.tools.tools import Bunch
  from statsmodels.tools.sm_exceptions import X13NotFoundError, IOWarning, X13Error, X13Warning
label_desc: Use image node_id 8 for calling a global function with example usage: _make_forecast_options(forecast_periods) and returns: forecast_spec, str