old_contents: import pytest
  import six
  
  from tilezilla import sensors
  
  
  def test_friendly_names_data():
      # Test this variable is dict
      # Should contain [SENSOR (str)]:[MAPPING (dict)]
      # where:
      #   MAPPING is a dict of [friendly_name (str)]:[band id (int)]
      assert isinstance(sensors.SENSOR_FRIENDLY_NAMES, dict)
      sensor_names = ['TM', 'ETM+', 'MSS', 'OLI_TIRS']  # ...
      for name in sensor_names:
          assert name in sensors.SENSOR_FRIENDLY_NAMES
  
      for name, mapping in six.iteritems(sensors.SENSOR_FRIENDLY_NAMES):
          for band_name, band_idx in six.iteritems(mapping):
              assert isinstance(band_name, str)
              assert isinstance(band_idx, int)
  
new_contents: import six
  
  from tilezilla import sensors
  
  
  def test_friendly_names_data():
      # Test this variable is dict
      # Should contain [SENSOR (str)]:[MAPPING (dict)]
      # where:
      #   MAPPING is a dict of [friendly_name (str)]:[band id (int)]
      assert isinstance(sensors.SENSOR_FRIENDLY_NAMES, dict)
      sensor_names = ['TM', 'ETM+', 'MSS', 'OLI_TIRS']  # ...
      for name in sensor_names:
          assert name in sensors.SENSOR_FRIENDLY_NAMES
  
      for name, mapping in six.iteritems(sensors.SENSOR_FRIENDLY_NAMES):
          for band_name, band_idx in six.iteritems(mapping):
              assert isinstance(band_name, six.string_types)
              assert isinstance(band_idx, int)
  
subject: Fix string type comparison for py2