old_contents: import os, sys, shutil
  import tempfile
  import unittest
  import netCDF4
  
  
  class test_filepath(unittest.TestCase):
  
      def setUp(self):
          self.netcdf_file = os.path.join(os.getcwd(), "netcdf_dummy_file.nc")
          self.nc = netCDF4.Dataset(self.netcdf_file)
  
      def test_filepath(self):
          assert self.nc.filepath() == str(self.netcdf_file)
  
      def test_filepath_with_non_ascii_characters(self):
          # create nc-file in a filepath using a cp1252 string
          tmpdir = tempfile.mkdtemp()
          filepath = os.path.join(tmpdir,b'Pl\xc3\xb6n.nc'.decode('cp1252'))
          nc = netCDF4.Dataset(filepath,'w',encoding='cp1252')
          filepatho = nc.filepath(encoding='cp1252')
          assert filepath == filepatho
          assert filepath.encode('cp1252') == filepatho.encode('cp1252')
          nc.close()
          shutil.rmtree(tmpdir)
  
      def test_no_such_file_raises(self):
          fname = 'not_a_nc_file.nc'
          with self.assertRaisesRegexp(IOError, fname):
              netCDF4.Dataset(fname, 'r')
  
  
  if __name__ == '__main__':
      unittest.main()
  
new_contents: import os, sys, shutil
  import tempfile
  import unittest
  import netCDF4
  
  
  class test_filepath(unittest.TestCase):
  
      def setUp(self):
          self.netcdf_file = os.path.join(os.getcwd(), "netcdf_dummy_file.nc")
          self.nc = netCDF4.Dataset(self.netcdf_file)
  
      def test_filepath(self):
          assert self.nc.filepath() == str(self.netcdf_file)
  
      def test_filepath_with_non_ascii_characters(self):
          # create nc-file in a filepath using a cp1252 string
          tmpdir = tempfile.mkdtemp()
          filepath = os.path.join(tmpdir,b'Pl\xc3\xb6n.nc'.decode('cp1252'))
          nc = netCDF4.Dataset(filepath,'w',encoding='cp1252')
          filepatho = nc.filepath(encoding='cp1252')
          assert filepath == filepatho
          assert filepath.encode('cp1252') == filepatho.encode('cp1252')
          nc.close()
          shutil.rmtree(tmpdir)
  
      def test_no_such_file_raises(self):
          fname = 'not_a_nc_file.nc'
          with self.assertRaisesRegex(IOError, fname):
              netCDF4.Dataset(fname, 'r')
  
  
  if __name__ == '__main__':
      unittest.main()
  
subject: Use assertRaisesRegex instead of assertRaisesRegexp for Python 3.11 compatibility.