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Update description of Index._values/values/ndarray_values #23507

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merged 4 commits into from
Nov 8, 2018
Merged

Update description of Index._values/values/ndarray_values #23507

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Update description of Index._values/values/ndarray_values
jorisvandenbossche Nov 5, 2018
ad6a4a4
codes -> ndarray[int]
jorisvandenbossche Nov 5, 2018
e58914f
Merge remote-tracking branch 'upstream/master' into jorisvandenbossch…
TomAugspurger Nov 6, 2018
36543b9
merge master [ci skip]
TomAugspurger Nov 6, 2018
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22 changes: 9 additions & 13 deletions pandas/core/indexes/base.py
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Original file line number Diff line number Diff line change
Expand Up @@ -709,7 +709,7 @@ def values(self):

@property
def _values(self):
# type: () -> Union[ExtensionArray, Index]
# type: () -> Union[ExtensionArray, Index, np.ndarray]
# TODO(EA): remove index types as they become extension arrays
"""The best array representation.

Expand All @@ -721,18 +721,14 @@ def _values(self):

It may differ from the public '.values' method.

index | values | _values | _ndarray_values |
----------------- | -------------- -| ----------- | --------------- |
CategoricalIndex | Categorical | Categorical | codes |
DatetimeIndex[tz] | ndarray[M8ns] | DTI[tz] | ndarray[M8ns] |

For the following, the ``._values`` is currently ``ndarray[object]``,
but will soon be an ``ExtensionArray``

index | values | _values | _ndarray_values |
----------------- | --------------- | ------------ | --------------- |
PeriodIndex | ndarray[object] | ndarray[obj] | ndarray[int] |
IntervalIndex | ndarray[object] | ndarray[obj] | ndarray[object] |
index | values | _values | _ndarray_values |
----------------- | --------------- | ------------- | --------------- |
Index | ndarray | ndarray | ndarray |
CategoricalIndex | Categorical | Categorical | codes |
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codes -> ndarray[int]

DatetimeIndex | ndarray[M8ns] | ndarray[M8ns] | ndarray[M8ns] |
DatetimeIndex[tz] | ndarray[M8ns] | DTI[tz] | ndarray[M8ns] |
PeriodIndex | ndarray[object] | PeriodArray | ndarray[int] |
IntervalIndex | IntervalArray | IntervalArray | ndarray[object] |

See Also
--------
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