import numpy as np import pytest import pandas.util._test_decorators as td from pandas import ( DataFrame, NaT, Series, Timestamp, date_range, period_range, ) import pandas._testing as tm class TestDataFrameValues: @td.skip_array_manager_invalid_test def test_values(self, float_frame, using_copy_on_write): if using_copy_on_write: with pytest.raises(ValueError, match="read-only"): float_frame.values[:, 0] = 5.0 assert (float_frame.values[:, 0] != 5).all() else: float_frame.values[:, 0] = 5.0 assert (float_frame.values[:, 0] == 5).all() def test_more_values(self, float_string_frame): values = float_string_frame.values assert values.shape[1] == len(float_string_frame.columns) def test_values_mixed_dtypes(self, float_frame, float_string_frame): frame = float_frame arr = frame.values frame_cols = frame.columns for i, row in enumerate(arr): for j, value in enumerate(row): col = frame_cols[j] if np.isnan(value): assert np.isnan(frame[col][i]) else: assert value == frame[col][i] # mixed type arr = float_string_frame[["foo", "A"]].values assert arr[0, 0] == "bar" df = DataFrame({"complex": [1j, 2j, 3j], "real": [1, 2, 3]}) arr = df.values assert arr[0, 0] == 1j def test_values_duplicates(self): df = DataFrame( [[1, 2, "a", "b"], [1, 2, "a", "b"]], columns=["one", "one", "two", "two"] ) result = df.values expected = np.array([[1, 2, "a", "b"], [1, 2, "a", "b"]], dtype=object) tm.assert_numpy_array_equal(result, expected) def test_values_with_duplicate_columns(self): df = DataFrame([[1, 2.5], [3, 4.5]], index=[1, 2], columns=["x", "x"]) result = df.values expected = np.array([[1, 2.5], [3, 4.5]]) assert (result == expected).all().all() @pytest.mark.parametrize("constructor", [date_range, period_range]) def test_values_casts_datetimelike_to_object(self, constructor): series = Series(constructor("2000-01-01", periods=10, freq="D")) expected = series.astype("object") df = DataFrame({"a": series, "b": np.random.randn(len(series))}) result = df.values.squeeze() assert (result[:, 0] == expected.values).all() df = DataFrame({"a": series, "b": ["foo"] * len(series)}) result = df.values.squeeze() assert (result[:, 0] == expected.values).all() def test_frame_values_with_tz(self): tz = "US/Central" df = DataFrame({"A": date_range("2000", periods=4, tz=tz)}) result = df.values expected = np.array( [ [Timestamp("2000-01-01", tz=tz)], [Timestamp("2000-01-02", tz=tz)], [Timestamp("2000-01-03", tz=tz)], [Timestamp("2000-01-04", tz=tz)], ] ) tm.assert_numpy_array_equal(result, expected) # two columns, homogeneous df["B"] = df["A"] result = df.values expected = np.concatenate([expected, expected], axis=1) tm.assert_numpy_array_equal(result, expected) # three columns, heterogeneous est = "US/Eastern" df["C"] = df["A"].dt.tz_convert(est) new = np.array( [ [Timestamp("2000-01-01T01:00:00", tz=est)], [Timestamp("2000-01-02T01:00:00", tz=est)], [Timestamp("2000-01-03T01:00:00", tz=est)], [Timestamp("2000-01-04T01:00:00", tz=est)], ] ) expected = np.concatenate([expected, new], axis=1) result = df.values tm.assert_numpy_array_equal(result, expected) def test_interleave_with_tzaware(self, timezone_frame): # interleave with object result = timezone_frame.assign(D="foo").values expected = np.array( [ [ Timestamp("2013-01-01 00:00:00"), Timestamp("2013-01-02 00:00:00"), Timestamp("2013-01-03 00:00:00"), ], [ Timestamp("2013-01-01 00:00:00-0500", tz="US/Eastern"), NaT, Timestamp("2013-01-03 00:00:00-0500", tz="US/Eastern"), ], [ Timestamp("2013-01-01 00:00:00+0100", tz="CET"), NaT, Timestamp("2013-01-03 00:00:00+0100", tz="CET"), ], ["foo", "foo", "foo"], ], dtype=object, ).T tm.assert_numpy_array_equal(result, expected) # interleave with only datetime64[ns] result = timezone_frame.values expected = np.array( [ [ Timestamp("2013-01-01 00:00:00"), Timestamp("2013-01-02 00:00:00"), Timestamp("2013-01-03 00:00:00"), ], [ Timestamp("2013-01-01 00:00:00-0500", tz="US/Eastern"), NaT, Timestamp("2013-01-03 00:00:00-0500", tz="US/Eastern"), ], [ Timestamp("2013-01-01 00:00:00+0100", tz="CET"), NaT, Timestamp("2013-01-03 00:00:00+0100", tz="CET"), ], ], dtype=object, ).T tm.assert_numpy_array_equal(result, expected) def test_values_interleave_non_unique_cols(self): df = DataFrame( [[Timestamp("20130101"), 3.5], [Timestamp("20130102"), 4.5]], columns=["x", "x"], index=[1, 2], ) df_unique = df.copy() df_unique.columns = ["x", "y"] assert df_unique.values.shape == df.values.shape tm.assert_numpy_array_equal(df_unique.values[0], df.values[0]) tm.assert_numpy_array_equal(df_unique.values[1], df.values[1]) def test_values_numeric_cols(self, float_frame): float_frame["foo"] = "bar" values = float_frame[["A", "B", "C", "D"]].values assert values.dtype == np.float64 def test_values_lcd(self, mixed_float_frame, mixed_int_frame): # mixed lcd values = mixed_float_frame[["A", "B", "C", "D"]].values assert values.dtype == np.float64 values = mixed_float_frame[["A", "B", "C"]].values assert values.dtype == np.float32 values = mixed_float_frame[["C"]].values assert values.dtype == np.float16 # GH#10364 # B uint64 forces float because there are other signed int types values = mixed_int_frame[["A", "B", "C", "D"]].values assert values.dtype == np.float64 values = mixed_int_frame[["A", "D"]].values assert values.dtype == np.int64 # B uint64 forces float because there are other signed int types values = mixed_int_frame[["A", "B", "C"]].values assert values.dtype == np.float64 # as B and C are both unsigned, no forcing to float is needed values = mixed_int_frame[["B", "C"]].values assert values.dtype == np.uint64 values = mixed_int_frame[["A", "C"]].values assert values.dtype == np.int32 values = mixed_int_frame[["C", "D"]].values assert values.dtype == np.int64 values = mixed_int_frame[["A"]].values assert values.dtype == np.int32 values = mixed_int_frame[["C"]].values assert values.dtype == np.uint8 class TestPrivateValues: @td.skip_array_manager_invalid_test def test_private_values_dt64tz(self, using_copy_on_write): dta = date_range("2000", periods=4, tz="US/Central")._data.reshape(-1, 1) df = DataFrame(dta, columns=["A"]) tm.assert_equal(df._values, dta) if using_copy_on_write: assert not np.shares_memory(df._values._ndarray, dta._ndarray) else: # we have a view assert np.shares_memory(df._values._ndarray, dta._ndarray) # TimedeltaArray tda = dta - dta df2 = df - df tm.assert_equal(df2._values, tda) @td.skip_array_manager_invalid_test def test_private_values_dt64tz_multicol(self, using_copy_on_write): dta = date_range("2000", periods=8, tz="US/Central")._data.reshape(-1, 2) df = DataFrame(dta, columns=["A", "B"]) tm.assert_equal(df._values, dta) if using_copy_on_write: assert not np.shares_memory(df._values._ndarray, dta._ndarray) else: # we have a view assert np.shares_memory(df._values._ndarray, dta._ndarray) # TimedeltaArray tda = dta - dta df2 = df - df tm.assert_equal(df2._values, tda) def test_private_values_dt64_multiblock(self): dta = date_range("2000", periods=8)._data df = DataFrame({"A": dta[:4]}, copy=False) df["B"] = dta[4:] assert len(df._mgr.arrays) == 2 result = df._values expected = dta.reshape(2, 4).T tm.assert_equal(result, expected)