That code was so bad I felt I had to step in too, I used chatGPT to simplify it a bit but it also introduced some errors, so I found what appears to be an input file to test it on [1]. The only difference with the awk program is that it uses spaces while the original python program used tabs.

  #!/usr/bin/env python3
  import sys
  
  freq, fc, ir = [], [], []
  with open(sys.argv[1]) as f:
      for line in f.readlines():
          words = line.split()
          if "Frequencies" in line:
              freq.extend(words[2:])
          elif "Frc consts" in line:
              fc.extend(words[3:])
          elif "IR Inten" in line:
              ir.extend(words[3:])
  
  for i in range(len(freq)):
      print(f"{freq[i]}\t{fc[i]}\t{ir[i]}")