code: def get_file(db_folder, file_name):
      
      if not os.path.isdir(db_folder):
          return
      file_name = file_name.lower().strip()
      for cand_name in os.listdir(db_folder):
          if cand_name.lower().strip() == file_name:
              return os.path.join(db_folder, cand_name)
docs: Glob for the poor.