Skip to content

BUG: Categorical constructor not idempotent with ext dtype #14191

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Closed
wants to merge 2 commits into from
Closed

BUG: Categorical constructor not idempotent with ext dtype #14191

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
2 commits
Select commit Hold shift + click to select a range
da865e2
BUG: Categorical constructor not idempotent with ext dtype
chris-b1 Sep 9, 2016
4cad147
add some nulls to tests
chris-b1 Sep 9, 2016
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
2 changes: 1 addition & 1 deletion doc/source/whatsnew/v0.19.0.txt
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -1427,7 +1427,7 @@ Bug Fixes

- Bug in ``SeriesGroupBy.transform`` with datetime values and missing groups (:issue:`13191`)
- Bug where empty ``Series`` were incorrectly coerced in datetime-like numeric operations (:issue:`13844`)

- Bug in ``Categorical`` constructor when passed a ``Categorical`` containing datetimes with timezones (:issue:`14190`)
- Bug in ``Series.str.extractall()`` with ``str`` index raises ``ValueError`` (:issue:`13156`)
- Bug in ``Series.str.extractall()`` with single group and quantifier (:issue:`13382`)
- Bug in ``DatetimeIndex`` and ``Period`` subtraction raises ``ValueError`` or ``AttributeError`` rather than ``TypeError`` (:issue:`13078`)
Expand Down
2 changes: 1 addition & 1 deletion pandas/core/categorical.py
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -259,7 +259,7 @@ def __init__(self, values, categories=None, ordered=False,
ordered = values.ordered
if categories is None:
categories = values.categories
values = values.__array__()
values = values.get_values()

elif isinstance(values, (ABCIndexClass, ABCSeries)):
pass
Expand Down
16 changes: 16 additions & 0 deletions pandas/tests/test_categorical.py
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -362,6 +362,22 @@ def test_constructor_from_index_series_period(self):
result = pd.Categorical(pd.Series(idx))
tm.assert_index_equal(result.categories, idx)

def test_constructor_invariant(self):
# GH 14190
vals = [
np.array([1., 1.2, 1.8, np.nan]),
np.array([1, 2, 3], dtype='int64'),
['a', 'b', 'c', np.nan],
[pd.Period('2014-01'), pd.Period('2014-02'), pd.NaT],
[pd.Timestamp('2014-01-01'), pd.Timestamp('2014-01-02'), pd.NaT],
[pd.Timestamp('2014-01-01', tz='US/Eastern'),
pd.Timestamp('2014-01-02', tz='US/Eastern'), pd.NaT],
]
for val in vals:
c = Categorical(val)
c2 = Categorical(c)
tm.assert_categorical_equal(c, c2)

def test_from_codes(self):

# too few categories
Expand Down