text: # -*- coding: utf-8 -*-
  
  import re
  
  import numpy as np
  import pytest
  
  import pandas as pd
  import pandas.util.testing as tm
  from pandas import IntervalIndex, MultiIndex, RangeIndex
  from pandas.compat import lrange, range
  from pandas.core.dtypes.cast import construct_1d_object_array_from_listlike
  
  
  def test_labels_dtypes():
  
      # GH 8456
      i = MultiIndex.from_tuples([('A', 1), ('A', 2)])
      assert i.labels[0].dtype == 'int8'
      assert i.labels[1].dtype == 'int8'
  
      i = MultiIndex.from_product([['a'], range(40)])
      assert i.labels[1].dtype == 'int8'
      i = MultiIndex.from_product([['a'], range(400)])
      assert i.labels[1].dtype == 'int16'
      i = MultiIndex.from_product([['a'], range(40000)])
      assert i.labels[1].dtype == 'int32'
  
      i = pd.MultiIndex.from_product([['a'], range(1000)])
      assert (i.labels[0] >= 0).all()
      assert (i.labels[1] >= 0).all()
  
  
  def test_values_boxed():
      tuples = [(1, pd.Timestamp('2000-01-01')), (2, pd.NaT),
                (3, pd.Timestamp('2000-01-03')),
                (1, pd.Timestamp('2000-01-04')),
                (2, pd.Timestamp('2000-01-02')),
                (3, pd.Timestamp('2000-01-03'))]
      result = pd.MultiIndex.from_tuples(tuples)
      expected = construct_1d_object_array_from_listlike(tuples)
      tm.assert_numpy_array_equal(result.values, expected)
      # Check that code branches for boxed values produce identical results
      tm.assert_numpy_array_equal(result.values[:4], result[:4].values)
  
  
  def test_values_multiindex_datetimeindex():
      # Test to ensure we hit the boxing / nobox part of MI.values
      ints = np.arange(10 ** 18, 10 ** 18 + 5)
      naive = pd.DatetimeIndex(ints)
      aware = pd.DatetimeIndex(ints, tz='US/Central')
  
      idx = pd.MultiIndex.from_arrays([naive, aware])
      result = idx.values
  
      outer = pd.DatetimeIndex([x[0] for x in result])
      tm.assert_index_equal(outer, naive)
  
      inner = pd.DatetimeIndex([x[1] for x in result])
      tm.assert_index_equal(inner, aware)
  
      # n_lev > n_lab
      result = idx[:2].values
  
      outer = pd.DatetimeIndex([x[0] for x in result])
      tm.assert_index_equal(outer, naive[:2])
  
      inner = pd.DatetimeIndex([x[1] for x in result])
      tm.assert_index_equal(inner, aware[:2])
  
  
  def test_values_multiindex_periodindex():
      # Test to ensure we hit the boxing / nobox part of MI.values
      ints = np.arange(2007, 2012)
      pidx = pd.PeriodIndex(ints, freq='D')
  
      idx = pd.MultiIndex.from_arrays([ints, pidx])
      result = idx.values
  
      outer = pd.Int64Index([x[0] for x in result])
      tm.assert_index_equal(outer, pd.Int64Index(ints))
  
      inner = pd.PeriodIndex([x[1] for x in result])
      tm.assert_index_equal(inner, pidx)
  
      # n_lev > n_lab
      result = idx[:2].values
  
      outer = pd.Int64Index([x[0] for x in result])
      tm.assert_index_equal(outer, pd.Int64Index(ints[:2]))
  
      inner = pd.PeriodIndex([x[1] for x in result])
      tm.assert_index_equal(inner, pidx[:2])
  
  
  def test_consistency():
      # need to construct an overflow
      major_axis = lrange(70000)
      minor_axis = lrange(10)
  
      major_labels = np.arange(70000)
      minor_labels = np.repeat(lrange(10), 7000)
  
      # the fact that is works means it's consistent
      index = MultiIndex(levels=[major_axis, minor_axis],
                         labels=[major_labels, minor_labels])
  
      # inconsistent
      major_labels = np.array([0, 0, 1, 1, 1, 2, 2, 3, 3])
      minor_labels = np.array([0, 1, 0, 1, 1, 0, 1, 0, 1])
      index = MultiIndex(levels=[major_axis, minor_axis],
                         labels=[major_labels, minor_labels])
  
      assert index.is_unique is False
  
  
  def test_hash_collisions():
      # non-smoke test that we don't get hash collisions
  
      index = MultiIndex.from_product([np.arange(1000), np.arange(1000)],
                                      names=['one', 'two'])
      result = index.get_indexer(index.values)
      tm.assert_numpy_array_equal(result, np.arange(
          len(index), dtype='intp'))
  
      for i in [0, 1, len(index) - 2, len(index) - 1]:
          result = index.get_loc(index[i])
          assert result == i
  
  
  def test_dims():
      pass
  
  
  def take_invalid_kwargs():
      vals = [['A', 'B'],
              [pd.Timestamp('2011-01-01'), pd.Timestamp('2011-01-02')]]
      idx = pd.MultiIndex.from_product(vals, names=['str', 'dt'])
      indices = [1, 2]
  
      msg = r"take\(\) got an unexpected keyword argument 'foo'"
      with pytest.raises(TypeError, match=msg):
          idx.take(indices, foo=2)
  
      msg = "the 'out' parameter is not supported"
      with pytest.raises(ValueError, match=msg):
          idx.take(indices, out=indices)
  
      msg = "the 'mode' parameter is not supported"
      with pytest.raises(ValueError, match=msg):
          idx.take(indices, mode='clip')
  
  
  def test_isna_behavior(idx):
      # should not segfault GH5123
      # NOTE: if MI representation changes, may make sense to allow
      # isna(MI)
      with pytest.raises(NotImplementedError):
          pd.isna(idx)
  
  
  def test_large_multiindex_error():
      # GH12527
      df_below_1000000 = pd.DataFrame(
          1, index=pd.MultiIndex.from_product([[1, 2], range(499999)]),
          columns=['dest'])
      with pytest.raises(KeyError):
          df_below_1000000.loc[(-1, 0), 'dest']
      with pytest.raises(KeyError):
          df_below_1000000.loc[(3, 0), 'dest']
      df_above_1000000 = pd.DataFrame(
          1, index=pd.MultiIndex.from_product([[1, 2], range(500001)]),
          columns=['dest'])
      with pytest.raises(KeyError):
          df_above_1000000.loc[(-1, 0), 'dest']
      with pytest.raises(KeyError):
          df_above_1000000.loc[(3, 0), 'dest']
  
  
  def test_million_record_attribute_error():
      # GH 18165
      r = list(range(1000000))
      df = pd.DataFrame({'a': r, 'b': r},
                        index=pd.MultiIndex.from_tuples([(x, x) for x in r]))
  
      msg = "'Series' object has no attribute 'foo'"
      with pytest.raises(AttributeError, match=msg):
          df['a'].foo()
  
  
  def test_can_hold_identifiers(idx):
      key = idx[0]
      assert idx._can_hold_identifiers_and_holds_name(key) is True
  
  
  def test_metadata_immutable(idx):
      levels, labels = idx.levels, idx.labels
      # shouldn't be able to set at either the top level or base level
      mutable_regex = re.compile('does not support mutable operations')
      with pytest.raises(TypeError, match=mutable_regex):
          levels[0] = levels[0]
      with pytest.raises(TypeError, match=mutable_regex):
          levels[0][0] = levels[0][0]
      # ditto for labels
      with pytest.raises(TypeError, match=mutable_regex):
          labels[0] = labels[0]
      with pytest.raises(TypeError, match=mutable_regex):
          labels[0][0] = labels[0][0]
      # and for names
      names = idx.names
      with pytest.raises(TypeError, match=mutable_regex):
          names[0] = names[0]
  
  
  def test_level_setting_resets_attributes():
      ind = pd.MultiIndex.from_arrays([
          ['A', 'A', 'B', 'B', 'B'], [1, 2, 1, 2, 3]
      ])
      assert ind.is_monotonic
      ind.set_levels([['A', 'B'], [1, 3, 2]], inplace=True)
      # if this fails, probably didn't reset the cache correctly.
      assert not ind.is_monotonic
  
  
  def test_rangeindex_fallback_coercion_bug():
      # GH 12893
      foo = pd.DataFrame(np.arange(100).reshape((10, 10)))
      bar = pd.DataFrame(np.arange(100).reshape((10, 10)))
      df = pd.concat({'foo': foo.stack(), 'bar': bar.stack()}, axis=1)
      df.index.names = ['fizz', 'buzz']
  
      str(df)
      expected = pd.DataFrame({'bar': np.arange(100),
                               'foo': np.arange(100)},
                              index=pd.MultiIndex.from_product(
                                  [range(10), range(10)],
                                  names=['fizz', 'buzz']))
      tm.assert_frame_equal(df, expected, check_like=True)
  
      result = df.index.get_level_values('fizz')
      expected = pd.Int64Index(np.arange(10), name='fizz').repeat(10)
      tm.assert_index_equal(result, expected)
  
      result = df.index.get_level_values('buzz')
      expected = pd.Int64Index(np.tile(np.arange(10), 10), name='buzz')
      tm.assert_index_equal(result, expected)
  
  
  def test_hash_error(indices):
      index = indices
      with pytest.raises(TypeError, match=("unhashable type: %r" %
                                           type(index).__name__)):
          hash(indices)
  
  
  def test_mutability(indices):
      if not len(indices):
          return
      pytest.raises(TypeError, indices.__setitem__, 0, indices[0])
  
  
  def test_wrong_number_names(indices):
      with pytest.raises(ValueError, match="^Length"):
          indices.names = ["apple", "banana", "carrot"]
  
  
  def test_memory_usage(idx):
      result = idx.memory_usage()
      if len(idx):
          idx.get_loc(idx[0])
          result2 = idx.memory_usage()
          result3 = idx.memory_usage(deep=True)
  
          # RangeIndex, IntervalIndex
          # don't have engines
          if not isinstance(idx, (RangeIndex, IntervalIndex)):
              assert result2 > result
  
          if idx.inferred_type == 'object':
              assert result3 > result2
  
      else:
  
          # we report 0 for no-length
          assert result == 0
  
  
  def test_nlevels(idx):
      assert idx.nlevels == 2
  