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Backport PR #31187 on branch 1.0.x (BUG: IntegerArray.astype(boolean)) #31254

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Merged
merged 1 commit into from
Jan 23, 2020
Merged

Backport PR #31187 on branch 1.0.x (BUG: IntegerArray.astype(boolean)) #31254

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7 changes: 7 additions & 0 deletions pandas/core/arrays/integer.py
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Original file line number Diff line number Diff line change
Expand Up @@ -19,6 +19,7 @@
is_list_like,
is_object_dtype,
is_scalar,
pandas_dtype,
)
from pandas.core.dtypes.dtypes import register_extension_dtype
from pandas.core.dtypes.missing import isna
Expand Down Expand Up @@ -440,11 +441,17 @@ def astype(self, dtype, copy=True):
if incompatible type with an IntegerDtype, equivalent of same_kind
casting
"""
from pandas.core.arrays.boolean import BooleanArray, BooleanDtype

dtype = pandas_dtype(dtype)

# if we are astyping to an existing IntegerDtype we can fastpath
if isinstance(dtype, _IntegerDtype):
result = self._data.astype(dtype.numpy_dtype, copy=False)
return type(self)(result, mask=self._mask, copy=False)
elif isinstance(dtype, BooleanDtype):
result = self._data.astype("bool", copy=False)
return BooleanArray(result, mask=self._mask, copy=False)

# coerce
if is_float_dtype(dtype):
Expand Down
7 changes: 7 additions & 0 deletions pandas/tests/arrays/test_integer.py
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Expand Up @@ -680,6 +680,13 @@ def test_astype_str(self):
tm.assert_numpy_array_equal(a.astype(str), expected)
tm.assert_numpy_array_equal(a.astype("str"), expected)

def test_astype_boolean(self):
# https://github.com/pandas-dev/pandas/issues/31102
a = pd.array([1, 0, -1, 2, None], dtype="Int64")
result = a.astype("boolean")
expected = pd.array([True, False, True, True, None], dtype="boolean")
tm.assert_extension_array_equal(result, expected)


def test_frame_repr(data_missing):

Expand Down