code: def invalid_textfile(filedir):
      # Generate and return an invalid filename.
      fd, path = mkstemp(suffix=".txt", prefix="dstmp_", dir=filedir)
      os.close(fd)
      os.remove(path)
      return path
  
imports: import os
  import pytest
  from tempfile import mkdtemp, mkstemp, NamedTemporaryFile
  from shutil import rmtree
  import numpy.lib._datasource
  from numpy.testing import assert_, assert_equal, assert_raises
  import urllib.request
  from urllib.parse import urlparse
  from urllib.error import URLError
label_desc: Use image node_id 5 for calling a global function with example usage: invalid_textfile(filedir) and returns: path