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ENH: RangeIndex._shallow_copy can return RangeIndex #47557

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Merged
merged 11 commits into from
Jul 8, 2022
Merged

ENH: RangeIndex._shallow_copy can return RangeIndex #47557

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a14be3a
ENH: RangeIndex._shallow_copy can return RangeIndex
mroeschke Jul 1, 2022
92f60b1
Merge remote-tracking branch 'upstream/main' into enh/range_shallowcopy
mroeschke Jul 5, 2022
c7dde8c
unique_deltas
mroeschke Jul 5, 2022
ba0b3b5
Merge remote-tracking branch 'upstream/main' into enh/range_shallowcopy
mroeschke Jul 5, 2022
76fbb72
off by diff
mroeschke Jul 5, 2022
8aeb814
Merge remote-tracking branch 'upstream/main' into enh/range_shallowcopy
mroeschke Jul 6, 2022
0c1d519
Add whatsnew and address 0 diff
mroeschke Jul 6, 2022
7d5d216
Add additional unit test
mroeschke Jul 6, 2022
2714076
Merge remote-tracking branch 'upstream/main' into enh/range_shallowcopy
mroeschke Jul 8, 2022
da4af1d
Add comment
mroeschke Jul 8, 2022
63e7894
Still return rangeindex if sort=False
mroeschke Jul 8, 2022
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4 changes: 4 additions & 0 deletions pandas/core/indexes/range.py
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Original file line number Diff line number Diff line change
Expand Up @@ -435,6 +435,10 @@ def _shallow_copy(self, values, name: Hashable = no_default):

if values.dtype.kind == "f":
return Float64Index(values, name=name)
unique_diffs = np.unique(np.diff(values))
if len(unique_diffs) == 1:
new_range = range(values[0], values[-1], unique_diffs[0])
return type(self)._simple_new(new_range, name=name)
return Int64Index._simple_new(values, name=name)

def _view(self: RangeIndex) -> RangeIndex:
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