code: def lexprobe(self):
      # Determine the token type for identifiers
      self.lexer.input("identifier")
      tok = self.lexer.token()
      if not tok or tok.value != "identifier":
          print("Couldn't determine identifier type")
      else:
          self.t_ID = tok.type
  
      # Determine the token type for integers
      self.lexer.input("12345")
      tok = self.lexer.token()
      if not tok or int(tok.value) != 12345:
          print("Couldn't determine integer type")
      else:
          self.t_INTEGER = tok.type
          self.t_INTEGER_TYPE = type(tok.value)
  
      # Determine the token type for strings enclosed in double quotes
      self.lexer.input('"filename"')
      tok = self.lexer.token()
      if not tok or tok.value != '"filename"':
          print("Couldn't determine string type")
      else:
          self.t_STRING = tok.type
  
      # Determine the token type for whitespace--if any
      self.lexer.input("  ")
      tok = self.lexer.token()
      if not tok or tok.value != "  ":
          self.t_SPACE = None
      else:
          self.t_SPACE = tok.type
  
      # Determine the token type for newlines
      self.lexer.input("\n")
      tok = self.lexer.token()
      if not tok or tok.value != "\n":
          self.t_NEWLINE = None
          print("Couldn't determine token for newlines")
      else:
          self.t_NEWLINE = tok.type
  
      self.t_WS = (self.t_SPACE, self.t_NEWLINE)
  
      # Check for other characters used by the preprocessor
      chars = ["<", ">", "#", "##", "\\", "(", ")", ",", "."]
      for c in chars:
          self.lexer.input(c)
          tok = self.lexer.token()
          if not tok or tok.value != c:
              print("Unable to lex '%s' required for preprocessor" % c)
  
imports: from __future__ import generators
  import sys
  import re
  import copy
  import time
  import os.path
label_desc: Use image node_id 4 for calling the Preprocessor obj's underlying member method code with example usage: obj.lexprobe() without return types