code: def dt_s_tup_to_string(dt_s_tup):
      dt_string = dt_s_tup[
          0
      ]  # string for identifying the file to parse.
      if dt_s_tup[1] > 0:  # if there are seasons in the model
          if (
              "co" in dt_string
              or "ci" in dt_string
              or "nc" in dt_string
          ):
              dt_string = dt_string[:2] + "s" + dt_string[2:]
          else:
              dt_string = "s" + dt_string
      return dt_string
  
file_path: statsmodels/statsmodels/tsa/vector_ar/tests/JMulTi_results/parse_jmulti_vecm_output.py
imports: import itertools
  import os
  import re
  import numpy
label_desc: Use image node_id 2 for calling a global function with example usage: dt_s_tup_to_string(dt_s_tup) and returns: dt_string