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TST: add nullable array frame constructor dtype tests #37972

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Merged
merged 2 commits into from
Nov 21, 2020
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TST: add nullable array frame constructor dtype tests #37972

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TST: add nullable array constructor dtype tests
arw2019 Nov 20, 2020
a3db81e
TST (feedback): add string example
arw2019 Nov 20, 2020
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15 changes: 15 additions & 0 deletions pandas/tests/frame/test_constructors.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1004,6 +1004,21 @@ def test_constructor_dtype(self, data, index, columns, dtype, expected):
df = DataFrame(data, index, columns, dtype)
assert df.values.dtype == expected

@pytest.mark.parametrize(
"data,input_dtype,expected_dtype",
(
([True, False, None], "boolean", pd.BooleanDtype),
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can you add string here as well

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Done

([1.0, 2.0, None], "Float64", pd.Float64Dtype),
([1, 2, None], "Int64", pd.Int64Dtype),
(["a", "b", "c"], "string", pd.StringDtype),
),
)
def test_constructor_dtype_nullable_extension_arrays(
self, data, input_dtype, expected_dtype
):
df = DataFrame({"a": data}, dtype=input_dtype)
assert df["a"].dtype == expected_dtype()

def test_constructor_scalar_inference(self):
data = {"int": 1, "bool": True, "float": 3.0, "complex": 4j, "object": "foo"}
df = DataFrame(data, index=np.arange(10))
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