code: def lpol_sdiff(s):
      """return coefficients for seasonal difference (1-L^s)
  
      just a trivial convenience function
  
      Parameters
      ----------
      s : int
          number of periods in season
  
      Returns
      -------
      sdiff : list, length s+1
      """
      return [1] + [0] * (s - 1) + [-1]
  
imports: from statsmodels.compat.numpy import NP_LT_2
  from statsmodels.compat.pandas import Appender
  import warnings
  import numpy
  from scipy import linalg, optimize, signal
  from statsmodels.tools.docstring import Docstring, remove_parameters
  from statsmodels.tools.validation import array_like
label_desc: Use image node_id 14 for calling a global function with example usage: lpol_sdiff(s) and returns: unknown