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PERF: DataFrame.T #44724

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Merged
merged 2 commits into from
Dec 2, 2021
Merged

PERF: DataFrame.T #44724

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PERF: DataFrame.T
jbrockmendel Dec 2, 2021
081c227
GH ref
jbrockmendel Dec 2, 2021
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2 changes: 1 addition & 1 deletion pandas/core/internals/construction.py
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Original file line number Diff line number Diff line change
Expand Up @@ -295,7 +295,7 @@ def ndarray_to_mgr(
copy_on_sanitize = False if typ == "array" else copy

vdtype = getattr(values, "dtype", None)
if is_1d_only_ea_dtype(vdtype) or isinstance(dtype, ExtensionDtype):
if is_1d_only_ea_dtype(vdtype) or is_1d_only_ea_dtype(dtype):
# GH#19157

if isinstance(values, (np.ndarray, ExtensionArray)) and values.ndim > 1:
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5 changes: 4 additions & 1 deletion pandas/tests/frame/test_constructors.py
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Expand Up @@ -70,13 +70,16 @@


class TestDataFrameConstructors:
def test_constructor_from_2d_datetimearray(self):
def test_constructor_from_2d_datetimearray(self, using_array_manager):
dti = date_range("2016-01-01", periods=6, tz="US/Pacific")
dta = dti._data.reshape(3, 2)

df = DataFrame(dta)
expected = DataFrame({0: dta[:, 0], 1: dta[:, 1]})
tm.assert_frame_equal(df, expected)
if not using_array_manager:
# GH#44724 big performance hit if we de-consolidate
assert len(df._mgr.blocks) == 1

def test_constructor_dict_with_tzaware_scalar(self):
# GH#42505
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