import numpy as np
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import pytest
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import pandas as pd
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from pandas.api.extensions import ExtensionArray
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from pandas.core.internals.blocks import EABackedBlock
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from pandas.tests.extension.base.base import BaseExtensionTests
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class BaseConstructorsTests(BaseExtensionTests):
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def test_from_sequence_from_cls(self, data):
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result = type(data)._from_sequence(data, dtype=data.dtype)
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self.assert_extension_array_equal(result, data)
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data = data[:0]
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result = type(data)._from_sequence(data, dtype=data.dtype)
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self.assert_extension_array_equal(result, data)
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def test_array_from_scalars(self, data):
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scalars = [data[0], data[1], data[2]]
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result = data._from_sequence(scalars)
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assert isinstance(result, type(data))
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def test_series_constructor(self, data):
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result = pd.Series(data, copy=False)
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assert result.dtype == data.dtype
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assert len(result) == len(data)
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if hasattr(result._mgr, "blocks"):
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assert isinstance(result._mgr.blocks[0], EABackedBlock)
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assert result._mgr.array is data
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# Series[EA] is unboxed / boxed correctly
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result2 = pd.Series(result)
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assert result2.dtype == data.dtype
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if hasattr(result._mgr, "blocks"):
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assert isinstance(result2._mgr.blocks[0], EABackedBlock)
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def test_series_constructor_no_data_with_index(self, dtype, na_value):
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result = pd.Series(index=[1, 2, 3], dtype=dtype)
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expected = pd.Series([na_value] * 3, index=[1, 2, 3], dtype=dtype)
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self.assert_series_equal(result, expected)
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# GH 33559 - empty index
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result = pd.Series(index=[], dtype=dtype)
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expected = pd.Series([], index=pd.Index([], dtype="object"), dtype=dtype)
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self.assert_series_equal(result, expected)
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def test_series_constructor_scalar_na_with_index(self, dtype, na_value):
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result = pd.Series(na_value, index=[1, 2, 3], dtype=dtype)
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expected = pd.Series([na_value] * 3, index=[1, 2, 3], dtype=dtype)
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self.assert_series_equal(result, expected)
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def test_series_constructor_scalar_with_index(self, data, dtype):
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scalar = data[0]
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result = pd.Series(scalar, index=[1, 2, 3], dtype=dtype)
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expected = pd.Series([scalar] * 3, index=[1, 2, 3], dtype=dtype)
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self.assert_series_equal(result, expected)
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result = pd.Series(scalar, index=["foo"], dtype=dtype)
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expected = pd.Series([scalar], index=["foo"], dtype=dtype)
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self.assert_series_equal(result, expected)
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@pytest.mark.parametrize("from_series", [True, False])
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def test_dataframe_constructor_from_dict(self, data, from_series):
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if from_series:
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data = pd.Series(data)
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result = pd.DataFrame({"A": data})
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assert result.dtypes["A"] == data.dtype
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assert result.shape == (len(data), 1)
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if hasattr(result._mgr, "blocks"):
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assert isinstance(result._mgr.blocks[0], EABackedBlock)
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assert isinstance(result._mgr.arrays[0], ExtensionArray)
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def test_dataframe_from_series(self, data):
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result = pd.DataFrame(pd.Series(data))
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assert result.dtypes[0] == data.dtype
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assert result.shape == (len(data), 1)
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if hasattr(result._mgr, "blocks"):
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assert isinstance(result._mgr.blocks[0], EABackedBlock)
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assert isinstance(result._mgr.arrays[0], ExtensionArray)
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def test_series_given_mismatched_index_raises(self, data):
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msg = r"Length of values \(3\) does not match length of index \(5\)"
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with pytest.raises(ValueError, match=msg):
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pd.Series(data[:3], index=[0, 1, 2, 3, 4])
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def test_from_dtype(self, data):
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# construct from our dtype & string dtype
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dtype = data.dtype
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expected = pd.Series(data)
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result = pd.Series(list(data), dtype=dtype)
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self.assert_series_equal(result, expected)
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result = pd.Series(list(data), dtype=str(dtype))
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self.assert_series_equal(result, expected)
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# gh-30280
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expected = pd.DataFrame(data).astype(dtype)
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result = pd.DataFrame(list(data), dtype=dtype)
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self.assert_frame_equal(result, expected)
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result = pd.DataFrame(list(data), dtype=str(dtype))
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self.assert_frame_equal(result, expected)
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def test_pandas_array(self, data):
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# pd.array(extension_array) should be idempotent...
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result = pd.array(data)
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self.assert_extension_array_equal(result, data)
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def test_pandas_array_dtype(self, data):
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# ... but specifying dtype will override idempotency
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result = pd.array(data, dtype=np.dtype(object))
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expected = pd.arrays.PandasArray(np.asarray(data, dtype=object))
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self.assert_equal(result, expected)
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def test_construct_empty_dataframe(self, dtype):
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# GH 33623
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result = pd.DataFrame(columns=["a"], dtype=dtype)
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expected = pd.DataFrame(
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{"a": pd.array([], dtype=dtype)}, index=pd.RangeIndex(0)
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)
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self.assert_frame_equal(result, expected)
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def test_empty(self, dtype):
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cls = dtype.construct_array_type()
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result = cls._empty((4,), dtype=dtype)
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assert isinstance(result, cls)
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assert result.dtype == dtype
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assert result.shape == (4,)
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# GH#19600 method on ExtensionDtype
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result2 = dtype.empty((4,))
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assert isinstance(result2, cls)
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assert result2.dtype == dtype
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assert result2.shape == (4,)
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result2 = dtype.empty(4)
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assert isinstance(result2, cls)
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assert result2.dtype == dtype
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assert result2.shape == (4,)
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