code: def _token(self, s=b""):
      while True:  # read until next whitespace
          c = self.fp.read(1)
          if not c or c in b_whitespace:
              break
          if c > b"\x79":
              raise ValueError("Expected ASCII value, found binary")
          s = s + c
          if len(s) > 9:
              raise ValueError("Expected int, got > 9 digits")
      return s
  
imports: from .None import Image, ImageFile
label_desc: Use image node_id 1 for calling the PpmImageFile obj's underlying member method code with example usage: obj._token(s) and returns: s