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"""
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test cython .agg behavior
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"""
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import numpy as np
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import pytest
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from pandas.core.dtypes.common import is_float_dtype
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import pandas as pd
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from pandas import (
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DataFrame,
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Index,
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NaT,
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Series,
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Timedelta,
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Timestamp,
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bdate_range,
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)
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import pandas._testing as tm
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@pytest.mark.parametrize(
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"op_name",
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[
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"count",
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"sum",
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"std",
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"var",
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"sem",
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"mean",
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pytest.param(
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"median",
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# ignore mean of empty slice
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# and all-NaN
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marks=[pytest.mark.filterwarnings("ignore::RuntimeWarning")],
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),
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"prod",
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"min",
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"max",
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],
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)
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def test_cythonized_aggers(op_name):
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data = {
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"A": [0, 0, 0, 0, 1, 1, 1, 1, 1, 1.0, np.nan, np.nan],
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"B": ["A", "B"] * 6,
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"C": np.random.randn(12),
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}
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df = DataFrame(data)
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df.loc[2:10:2, "C"] = np.nan
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op = lambda x: getattr(x, op_name)()
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# single column
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grouped = df.drop(["B"], axis=1).groupby("A")
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exp = {cat: op(group["C"]) for cat, group in grouped}
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exp = DataFrame({"C": exp})
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exp.index.name = "A"
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result = op(grouped)
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tm.assert_frame_equal(result, exp)
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# multiple columns
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grouped = df.groupby(["A", "B"])
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expd = {}
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for (cat1, cat2), group in grouped:
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expd.setdefault(cat1, {})[cat2] = op(group["C"])
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exp = DataFrame(expd).T.stack(dropna=False)
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exp.index.names = ["A", "B"]
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exp.name = "C"
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result = op(grouped)["C"]
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if op_name in ["sum", "prod"]:
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tm.assert_series_equal(result, exp)
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def test_cython_agg_boolean():
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frame = DataFrame(
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{
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"a": np.random.randint(0, 5, 50),
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"b": np.random.randint(0, 2, 50).astype("bool"),
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}
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)
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result = frame.groupby("a")["b"].mean()
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expected = frame.groupby("a")["b"].agg(np.mean)
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tm.assert_series_equal(result, expected)
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def test_cython_agg_nothing_to_agg():
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frame = DataFrame({"a": np.random.randint(0, 5, 50), "b": ["foo", "bar"] * 25})
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with pytest.raises(NotImplementedError, match="does not implement"):
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frame.groupby("a")["b"].mean(numeric_only=True)
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with pytest.raises(TypeError, match="Could not convert (foo|bar)*"):
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frame.groupby("a")["b"].mean()
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frame = DataFrame({"a": np.random.randint(0, 5, 50), "b": ["foo", "bar"] * 25})
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with tm.assert_produces_warning(FutureWarning):
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result = frame[["b"]].groupby(frame["a"]).mean()
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expected = DataFrame([], index=frame["a"].sort_values().drop_duplicates())
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tm.assert_frame_equal(result, expected)
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def test_cython_agg_nothing_to_agg_with_dates():
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frame = DataFrame(
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{
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"a": np.random.randint(0, 5, 50),
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"b": ["foo", "bar"] * 25,
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"dates": pd.date_range("now", periods=50, freq="T"),
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}
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)
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with pytest.raises(NotImplementedError, match="does not implement"):
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frame.groupby("b").dates.mean(numeric_only=True)
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def test_cython_agg_frame_columns():
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# #2113
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df = DataFrame({"x": [1, 2, 3], "y": [3, 4, 5]})
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df.groupby(level=0, axis="columns").mean()
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df.groupby(level=0, axis="columns").mean()
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df.groupby(level=0, axis="columns").mean()
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df.groupby(level=0, axis="columns").mean()
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def test_cython_agg_return_dict():
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# GH 16741
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df = DataFrame(
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{
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"A": ["foo", "bar", "foo", "bar", "foo", "bar", "foo", "foo"],
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"B": ["one", "one", "two", "three", "two", "two", "one", "three"],
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"C": np.random.randn(8),
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"D": np.random.randn(8),
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}
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)
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ts = df.groupby("A")["B"].agg(lambda x: x.value_counts().to_dict())
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expected = Series(
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[{"two": 1, "one": 1, "three": 1}, {"two": 2, "one": 2, "three": 1}],
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index=Index(["bar", "foo"], name="A"),
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name="B",
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)
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tm.assert_series_equal(ts, expected)
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def test_cython_fail_agg():
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dr = bdate_range("1/1/2000", periods=50)
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ts = Series(["A", "B", "C", "D", "E"] * 10, index=dr)
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grouped = ts.groupby(lambda x: x.month)
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summed = grouped.sum()
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expected = grouped.agg(np.sum)
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tm.assert_series_equal(summed, expected)
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@pytest.mark.parametrize(
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"op, targop",
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[
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("mean", np.mean),
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("median", np.median),
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("var", np.var),
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("add", np.sum),
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("prod", np.prod),
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("min", np.min),
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("max", np.max),
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("first", lambda x: x.iloc[0]),
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("last", lambda x: x.iloc[-1]),
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],
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)
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def test__cython_agg_general(op, targop):
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df = DataFrame(np.random.randn(1000))
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labels = np.random.randint(0, 50, size=1000).astype(float)
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result = df.groupby(labels)._cython_agg_general(op, alt=None, numeric_only=True)
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expected = df.groupby(labels).agg(targop)
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tm.assert_frame_equal(result, expected)
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@pytest.mark.parametrize(
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"op, targop",
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[
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("mean", np.mean),
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("median", lambda x: np.median(x) if len(x) > 0 else np.nan),
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("var", lambda x: np.var(x, ddof=1)),
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("min", np.min),
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("max", np.max),
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],
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)
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def test_cython_agg_empty_buckets(op, targop, observed):
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df = DataFrame([11, 12, 13])
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grps = range(0, 55, 5)
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# calling _cython_agg_general directly, instead of via the user API
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# which sets different values for min_count, so do that here.
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g = df.groupby(pd.cut(df[0], grps), observed=observed)
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result = g._cython_agg_general(op, alt=None, numeric_only=True)
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g = df.groupby(pd.cut(df[0], grps), observed=observed)
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expected = g.agg(lambda x: targop(x))
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tm.assert_frame_equal(result, expected)
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def test_cython_agg_empty_buckets_nanops(observed):
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# GH-18869 can't call nanops on empty groups, so hardcode expected
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# for these
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df = DataFrame([11, 12, 13], columns=["a"])
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grps = range(0, 25, 5)
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# add / sum
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result = df.groupby(pd.cut(df["a"], grps), observed=observed)._cython_agg_general(
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"add", alt=None, numeric_only=True
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)
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intervals = pd.interval_range(0, 20, freq=5)
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expected = DataFrame(
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{"a": [0, 0, 36, 0]},
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index=pd.CategoricalIndex(intervals, name="a", ordered=True),
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)
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if observed:
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expected = expected[expected.a != 0]
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tm.assert_frame_equal(result, expected)
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# prod
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result = df.groupby(pd.cut(df["a"], grps), observed=observed)._cython_agg_general(
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"prod", alt=None, numeric_only=True
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)
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expected = DataFrame(
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{"a": [1, 1, 1716, 1]},
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index=pd.CategoricalIndex(intervals, name="a", ordered=True),
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)
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if observed:
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expected = expected[expected.a != 1]
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tm.assert_frame_equal(result, expected)
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@pytest.mark.parametrize("op", ["first", "last", "max", "min"])
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@pytest.mark.parametrize(
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"data", [Timestamp("2016-10-14 21:00:44.557"), Timedelta("17088 days 21:00:44.557")]
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)
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def test_cython_with_timestamp_and_nat(op, data):
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# https://github.com/pandas-dev/pandas/issues/19526
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df = DataFrame({"a": [0, 1], "b": [data, NaT]})
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index = Index([0, 1], name="a")
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# We will group by a and test the cython aggregations
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expected = DataFrame({"b": [data, NaT]}, index=index)
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result = df.groupby("a").aggregate(op)
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tm.assert_frame_equal(expected, result)
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@pytest.mark.parametrize(
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"agg",
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[
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"min",
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"max",
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"count",
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"sum",
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"prod",
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"var",
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"mean",
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"median",
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"ohlc",
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"cumprod",
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"cumsum",
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"shift",
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"any",
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"all",
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"quantile",
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"first",
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"last",
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"rank",
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"cummin",
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"cummax",
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],
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)
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def test_read_only_buffer_source_agg(agg):
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# https://github.com/pandas-dev/pandas/issues/36014
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df = DataFrame(
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{
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"sepal_length": [5.1, 4.9, 4.7, 4.6, 5.0],
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"species": ["setosa", "setosa", "setosa", "setosa", "setosa"],
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}
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)
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df._mgr.arrays[0].flags.writeable = False
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result = df.groupby(["species"]).agg({"sepal_length": agg})
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expected = df.copy().groupby(["species"]).agg({"sepal_length": agg})
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tm.assert_equal(result, expected)
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@pytest.mark.parametrize(
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"op_name",
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[
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"count",
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"sum",
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"std",
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"var",
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"sem",
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"mean",
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"median",
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"prod",
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"min",
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"max",
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],
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)
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def test_cython_agg_nullable_int(op_name):
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# ensure that the cython-based aggregations don't fail for nullable dtype
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# (eg https://github.com/pandas-dev/pandas/issues/37415)
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df = DataFrame(
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{
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"A": ["A", "B"] * 5,
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"B": pd.array([1, 2, 3, 4, 5, 6, 7, 8, 9, pd.NA], dtype="Int64"),
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}
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)
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result = getattr(df.groupby("A")["B"], op_name)()
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df2 = df.assign(B=df["B"].astype("float64"))
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expected = getattr(df2.groupby("A")["B"], op_name)()
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if op_name != "count":
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# the result is not yet consistently using Int64/Float64 dtype,
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# so for now just checking the values by casting to float
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result = result.astype("float64")
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tm.assert_series_equal(result, expected)
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@pytest.mark.parametrize("with_na", [True, False])
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@pytest.mark.parametrize(
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"op_name, action",
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[
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# ("count", "always_int"),
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("sum", "large_int"),
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# ("std", "always_float"),
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("var", "always_float"),
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# ("sem", "always_float"),
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("mean", "always_float"),
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("median", "always_float"),
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("prod", "large_int"),
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("min", "preserve"),
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("max", "preserve"),
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("first", "preserve"),
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("last", "preserve"),
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||||
],
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)
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@pytest.mark.parametrize(
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"data",
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[
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pd.array([1, 2, 3, 4], dtype="Int64"),
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pd.array([1, 2, 3, 4], dtype="Int8"),
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pd.array([0.1, 0.2, 0.3, 0.4], dtype="Float32"),
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pd.array([0.1, 0.2, 0.3, 0.4], dtype="Float64"),
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pd.array([True, True, False, False], dtype="boolean"),
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],
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)
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def test_cython_agg_EA_known_dtypes(data, op_name, action, with_na):
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if with_na:
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data[3] = pd.NA
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df = DataFrame({"key": ["a", "a", "b", "b"], "col": data})
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grouped = df.groupby("key")
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if action == "always_int":
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# always Int64
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expected_dtype = pd.Int64Dtype()
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elif action == "large_int":
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# for any int/bool use Int64, for float preserve dtype
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if is_float_dtype(data.dtype):
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expected_dtype = data.dtype
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else:
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expected_dtype = pd.Int64Dtype()
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elif action == "always_float":
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# for any int/bool use Float64, for float preserve dtype
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if is_float_dtype(data.dtype):
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expected_dtype = data.dtype
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else:
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expected_dtype = pd.Float64Dtype()
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elif action == "preserve":
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expected_dtype = data.dtype
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result = getattr(grouped, op_name)()
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assert result["col"].dtype == expected_dtype
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result = grouped.aggregate(op_name)
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assert result["col"].dtype == expected_dtype
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result = getattr(grouped["col"], op_name)()
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assert result.dtype == expected_dtype
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result = grouped["col"].aggregate(op_name)
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assert result.dtype == expected_dtype
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@ -0,0 +1,189 @@
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import numpy as np
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import pytest
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from pandas.errors import NumbaUtilError
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import pandas.util._test_decorators as td
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|
||||
from pandas import (
|
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DataFrame,
|
||||
Index,
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||||
NamedAgg,
|
||||
Series,
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||||
option_context,
|
||||
)
|
||||
import pandas._testing as tm
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||||
from pandas.core.util.numba_ import NUMBA_FUNC_CACHE
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@td.skip_if_no("numba")
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def test_correct_function_signature():
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def incorrect_function(x):
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return sum(x) * 2.7
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data = DataFrame(
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{"key": ["a", "a", "b", "b", "a"], "data": [1.0, 2.0, 3.0, 4.0, 5.0]},
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columns=["key", "data"],
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)
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with pytest.raises(NumbaUtilError, match="The first 2"):
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data.groupby("key").agg(incorrect_function, engine="numba")
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with pytest.raises(NumbaUtilError, match="The first 2"):
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data.groupby("key")["data"].agg(incorrect_function, engine="numba")
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@td.skip_if_no("numba")
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def test_check_nopython_kwargs():
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def incorrect_function(x, **kwargs):
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return sum(x) * 2.7
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|
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data = DataFrame(
|
||||
{"key": ["a", "a", "b", "b", "a"], "data": [1.0, 2.0, 3.0, 4.0, 5.0]},
|
||||
columns=["key", "data"],
|
||||
)
|
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with pytest.raises(NumbaUtilError, match="numba does not support"):
|
||||
data.groupby("key").agg(incorrect_function, engine="numba", a=1)
|
||||
|
||||
with pytest.raises(NumbaUtilError, match="numba does not support"):
|
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data.groupby("key")["data"].agg(incorrect_function, engine="numba", a=1)
|
||||
|
||||
|
||||
@td.skip_if_no("numba")
|
||||
@pytest.mark.filterwarnings("ignore:\n")
|
||||
# Filter warnings when parallel=True and the function can't be parallelized by Numba
|
||||
@pytest.mark.parametrize("jit", [True, False])
|
||||
@pytest.mark.parametrize("pandas_obj", ["Series", "DataFrame"])
|
||||
def test_numba_vs_cython(jit, pandas_obj, nogil, parallel, nopython):
|
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def func_numba(values, index):
|
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return np.mean(values) * 2.7
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||||
|
||||
if jit:
|
||||
# Test accepted jitted functions
|
||||
import numba
|
||||
|
||||
func_numba = numba.jit(func_numba)
|
||||
|
||||
data = DataFrame(
|
||||
{0: ["a", "a", "b", "b", "a"], 1: [1.0, 2.0, 3.0, 4.0, 5.0]}, columns=[0, 1]
|
||||
)
|
||||
engine_kwargs = {"nogil": nogil, "parallel": parallel, "nopython": nopython}
|
||||
grouped = data.groupby(0)
|
||||
if pandas_obj == "Series":
|
||||
grouped = grouped[1]
|
||||
|
||||
result = grouped.agg(func_numba, engine="numba", engine_kwargs=engine_kwargs)
|
||||
expected = grouped.agg(lambda x: np.mean(x) * 2.7, engine="cython")
|
||||
|
||||
tm.assert_equal(result, expected)
|
||||
|
||||
|
||||
@td.skip_if_no("numba")
|
||||
@pytest.mark.filterwarnings("ignore:\n")
|
||||
# Filter warnings when parallel=True and the function can't be parallelized by Numba
|
||||
@pytest.mark.parametrize("jit", [True, False])
|
||||
@pytest.mark.parametrize("pandas_obj", ["Series", "DataFrame"])
|
||||
def test_cache(jit, pandas_obj, nogil, parallel, nopython):
|
||||
# Test that the functions are cached correctly if we switch functions
|
||||
def func_1(values, index):
|
||||
return np.mean(values) - 3.4
|
||||
|
||||
def func_2(values, index):
|
||||
return np.mean(values) * 2.7
|
||||
|
||||
if jit:
|
||||
import numba
|
||||
|
||||
func_1 = numba.jit(func_1)
|
||||
func_2 = numba.jit(func_2)
|
||||
|
||||
data = DataFrame(
|
||||
{0: ["a", "a", "b", "b", "a"], 1: [1.0, 2.0, 3.0, 4.0, 5.0]}, columns=[0, 1]
|
||||
)
|
||||
engine_kwargs = {"nogil": nogil, "parallel": parallel, "nopython": nopython}
|
||||
grouped = data.groupby(0)
|
||||
if pandas_obj == "Series":
|
||||
grouped = grouped[1]
|
||||
|
||||
result = grouped.agg(func_1, engine="numba", engine_kwargs=engine_kwargs)
|
||||
expected = grouped.agg(lambda x: np.mean(x) - 3.4, engine="cython")
|
||||
tm.assert_equal(result, expected)
|
||||
# func_1 should be in the cache now
|
||||
assert (func_1, "groupby_agg") in NUMBA_FUNC_CACHE
|
||||
|
||||
# Add func_2 to the cache
|
||||
result = grouped.agg(func_2, engine="numba", engine_kwargs=engine_kwargs)
|
||||
expected = grouped.agg(lambda x: np.mean(x) * 2.7, engine="cython")
|
||||
tm.assert_equal(result, expected)
|
||||
assert (func_2, "groupby_agg") in NUMBA_FUNC_CACHE
|
||||
|
||||
# Retest func_1 which should use the cache
|
||||
result = grouped.agg(func_1, engine="numba", engine_kwargs=engine_kwargs)
|
||||
expected = grouped.agg(lambda x: np.mean(x) - 3.4, engine="cython")
|
||||
tm.assert_equal(result, expected)
|
||||
|
||||
|
||||
@td.skip_if_no("numba")
|
||||
def test_use_global_config():
|
||||
def func_1(values, index):
|
||||
return np.mean(values) - 3.4
|
||||
|
||||
data = DataFrame(
|
||||
{0: ["a", "a", "b", "b", "a"], 1: [1.0, 2.0, 3.0, 4.0, 5.0]}, columns=[0, 1]
|
||||
)
|
||||
grouped = data.groupby(0)
|
||||
expected = grouped.agg(func_1, engine="numba")
|
||||
with option_context("compute.use_numba", True):
|
||||
result = grouped.agg(func_1, engine=None)
|
||||
tm.assert_frame_equal(expected, result)
|
||||
|
||||
|
||||
@td.skip_if_no("numba")
|
||||
@pytest.mark.parametrize(
|
||||
"agg_func",
|
||||
[
|
||||
["min", "max"],
|
||||
"min",
|
||||
{"B": ["min", "max"], "C": "sum"},
|
||||
NamedAgg(column="B", aggfunc="min"),
|
||||
],
|
||||
)
|
||||
def test_multifunc_notimplimented(agg_func):
|
||||
data = DataFrame(
|
||||
{0: ["a", "a", "b", "b", "a"], 1: [1.0, 2.0, 3.0, 4.0, 5.0]}, columns=[0, 1]
|
||||
)
|
||||
grouped = data.groupby(0)
|
||||
with pytest.raises(NotImplementedError, match="Numba engine can"):
|
||||
grouped.agg(agg_func, engine="numba")
|
||||
|
||||
with pytest.raises(NotImplementedError, match="Numba engine can"):
|
||||
grouped[1].agg(agg_func, engine="numba")
|
||||
|
||||
|
||||
@td.skip_if_no("numba")
|
||||
def test_args_not_cached():
|
||||
# GH 41647
|
||||
def sum_last(values, index, n):
|
||||
return values[-n:].sum()
|
||||
|
||||
df = DataFrame({"id": [0, 0, 1, 1], "x": [1, 1, 1, 1]})
|
||||
grouped_x = df.groupby("id")["x"]
|
||||
result = grouped_x.agg(sum_last, 1, engine="numba")
|
||||
expected = Series([1.0] * 2, name="x", index=Index([0, 1], name="id"))
|
||||
tm.assert_series_equal(result, expected)
|
||||
|
||||
result = grouped_x.agg(sum_last, 2, engine="numba")
|
||||
expected = Series([2.0] * 2, name="x", index=Index([0, 1], name="id"))
|
||||
tm.assert_series_equal(result, expected)
|
||||
|
||||
|
||||
@td.skip_if_no("numba")
|
||||
def test_index_data_correctly_passed():
|
||||
# GH 43133
|
||||
def f(values, index):
|
||||
return np.mean(index)
|
||||
|
||||
df = DataFrame({"group": ["A", "A", "B"], "v": [4, 5, 6]}, index=[-1, -2, -3])
|
||||
result = df.groupby("group").aggregate(f, engine="numba")
|
||||
expected = DataFrame(
|
||||
[-1.5, -3.0], columns=["v"], index=Index(["A", "B"], name="group")
|
||||
)
|
||||
tm.assert_frame_equal(result, expected)
|
||||
@ -0,0 +1,673 @@
|
||||
"""
|
||||
test all other .agg behavior
|
||||
"""
|
||||
|
||||
import datetime as dt
|
||||
from functools import partial
|
||||
|
||||
import numpy as np
|
||||
import pytest
|
||||
|
||||
import pandas as pd
|
||||
from pandas import (
|
||||
DataFrame,
|
||||
Index,
|
||||
MultiIndex,
|
||||
PeriodIndex,
|
||||
Series,
|
||||
date_range,
|
||||
period_range,
|
||||
)
|
||||
import pandas._testing as tm
|
||||
from pandas.core.base import SpecificationError
|
||||
|
||||
from pandas.io.formats.printing import pprint_thing
|
||||
|
||||
|
||||
def test_agg_api():
|
||||
# GH 6337
|
||||
# https://stackoverflow.com/questions/21706030/pandas-groupby-agg-function-column-dtype-error
|
||||
# different api for agg when passed custom function with mixed frame
|
||||
|
||||
df = DataFrame(
|
||||
{
|
||||
"data1": np.random.randn(5),
|
||||
"data2": np.random.randn(5),
|
||||
"key1": ["a", "a", "b", "b", "a"],
|
||||
"key2": ["one", "two", "one", "two", "one"],
|
||||
}
|
||||
)
|
||||
grouped = df.groupby("key1")
|
||||
|
||||
def peak_to_peak(arr):
|
||||
return arr.max() - arr.min()
|
||||
|
||||
with tm.assert_produces_warning(
|
||||
FutureWarning,
|
||||
match=r"\['key2'\] did not aggregate successfully",
|
||||
):
|
||||
expected = grouped.agg([peak_to_peak])
|
||||
expected.columns = ["data1", "data2"]
|
||||
|
||||
with tm.assert_produces_warning(
|
||||
FutureWarning,
|
||||
match=r"\['key2'\] did not aggregate successfully",
|
||||
):
|
||||
result = grouped.agg(peak_to_peak)
|
||||
tm.assert_frame_equal(result, expected)
|
||||
|
||||
|
||||
def test_agg_datetimes_mixed():
|
||||
data = [[1, "2012-01-01", 1.0], [2, "2012-01-02", 2.0], [3, None, 3.0]]
|
||||
|
||||
df1 = DataFrame(
|
||||
{
|
||||
"key": [x[0] for x in data],
|
||||
"date": [x[1] for x in data],
|
||||
"value": [x[2] for x in data],
|
||||
}
|
||||
)
|
||||
|
||||
data = [
|
||||
[
|
||||
row[0],
|
||||
(dt.datetime.strptime(row[1], "%Y-%m-%d").date() if row[1] else None),
|
||||
row[2],
|
||||
]
|
||||
for row in data
|
||||
]
|
||||
|
||||
df2 = DataFrame(
|
||||
{
|
||||
"key": [x[0] for x in data],
|
||||
"date": [x[1] for x in data],
|
||||
"value": [x[2] for x in data],
|
||||
}
|
||||
)
|
||||
|
||||
df1["weights"] = df1["value"] / df1["value"].sum()
|
||||
gb1 = df1.groupby("date").aggregate(np.sum)
|
||||
|
||||
df2["weights"] = df1["value"] / df1["value"].sum()
|
||||
gb2 = df2.groupby("date").aggregate(np.sum)
|
||||
|
||||
assert len(gb1) == len(gb2)
|
||||
|
||||
|
||||
def test_agg_period_index():
|
||||
prng = period_range("2012-1-1", freq="M", periods=3)
|
||||
df = DataFrame(np.random.randn(3, 2), index=prng)
|
||||
rs = df.groupby(level=0).sum()
|
||||
assert isinstance(rs.index, PeriodIndex)
|
||||
|
||||
# GH 3579
|
||||
index = period_range(start="1999-01", periods=5, freq="M")
|
||||
s1 = Series(np.random.rand(len(index)), index=index)
|
||||
s2 = Series(np.random.rand(len(index)), index=index)
|
||||
df = DataFrame.from_dict({"s1": s1, "s2": s2})
|
||||
grouped = df.groupby(df.index.month)
|
||||
list(grouped)
|
||||
|
||||
|
||||
def test_agg_dict_parameter_cast_result_dtypes():
|
||||
# GH 12821
|
||||
|
||||
df = DataFrame(
|
||||
{
|
||||
"class": ["A", "A", "B", "B", "C", "C", "D", "D"],
|
||||
"time": date_range("1/1/2011", periods=8, freq="H"),
|
||||
}
|
||||
)
|
||||
df.loc[[0, 1, 2, 5], "time"] = None
|
||||
|
||||
# test for `first` function
|
||||
exp = df.loc[[0, 3, 4, 6]].set_index("class")
|
||||
grouped = df.groupby("class")
|
||||
tm.assert_frame_equal(grouped.first(), exp)
|
||||
tm.assert_frame_equal(grouped.agg("first"), exp)
|
||||
tm.assert_frame_equal(grouped.agg({"time": "first"}), exp)
|
||||
tm.assert_series_equal(grouped.time.first(), exp["time"])
|
||||
tm.assert_series_equal(grouped.time.agg("first"), exp["time"])
|
||||
|
||||
# test for `last` function
|
||||
exp = df.loc[[0, 3, 4, 7]].set_index("class")
|
||||
grouped = df.groupby("class")
|
||||
tm.assert_frame_equal(grouped.last(), exp)
|
||||
tm.assert_frame_equal(grouped.agg("last"), exp)
|
||||
tm.assert_frame_equal(grouped.agg({"time": "last"}), exp)
|
||||
tm.assert_series_equal(grouped.time.last(), exp["time"])
|
||||
tm.assert_series_equal(grouped.time.agg("last"), exp["time"])
|
||||
|
||||
# count
|
||||
exp = Series([2, 2, 2, 2], index=Index(list("ABCD"), name="class"), name="time")
|
||||
tm.assert_series_equal(grouped.time.agg(len), exp)
|
||||
tm.assert_series_equal(grouped.time.size(), exp)
|
||||
|
||||
exp = Series([0, 1, 1, 2], index=Index(list("ABCD"), name="class"), name="time")
|
||||
tm.assert_series_equal(grouped.time.count(), exp)
|
||||
|
||||
|
||||
def test_agg_cast_results_dtypes():
|
||||
# similar to GH12821
|
||||
# xref #11444
|
||||
u = [dt.datetime(2015, x + 1, 1) for x in range(12)]
|
||||
v = list("aaabbbbbbccd")
|
||||
df = DataFrame({"X": v, "Y": u})
|
||||
|
||||
result = df.groupby("X")["Y"].agg(len)
|
||||
expected = df.groupby("X")["Y"].count()
|
||||
tm.assert_series_equal(result, expected)
|
||||
|
||||
|
||||
def test_aggregate_float64_no_int64():
|
||||
# see gh-11199
|
||||
df = DataFrame({"a": [1, 2, 3, 4, 5], "b": [1, 2, 2, 4, 5], "c": [1, 2, 3, 4, 5]})
|
||||
|
||||
expected = DataFrame({"a": [1, 2.5, 4, 5]}, index=[1, 2, 4, 5])
|
||||
expected.index.name = "b"
|
||||
|
||||
result = df.groupby("b")[["a"]].mean()
|
||||
tm.assert_frame_equal(result, expected)
|
||||
|
||||
expected = DataFrame({"a": [1, 2.5, 4, 5], "c": [1, 2.5, 4, 5]}, index=[1, 2, 4, 5])
|
||||
expected.index.name = "b"
|
||||
|
||||
result = df.groupby("b")[["a", "c"]].mean()
|
||||
tm.assert_frame_equal(result, expected)
|
||||
|
||||
|
||||
def test_aggregate_api_consistency():
|
||||
# GH 9052
|
||||
# make sure that the aggregates via dict
|
||||
# are consistent
|
||||
df = DataFrame(
|
||||
{
|
||||
"A": ["foo", "bar", "foo", "bar", "foo", "bar", "foo", "foo"],
|
||||
"B": ["one", "one", "two", "two", "two", "two", "one", "two"],
|
||||
"C": np.random.randn(8) + 1.0,
|
||||
"D": np.arange(8),
|
||||
}
|
||||
)
|
||||
|
||||
grouped = df.groupby(["A", "B"])
|
||||
c_mean = grouped["C"].mean()
|
||||
c_sum = grouped["C"].sum()
|
||||
d_mean = grouped["D"].mean()
|
||||
d_sum = grouped["D"].sum()
|
||||
|
||||
result = grouped["D"].agg(["sum", "mean"])
|
||||
expected = pd.concat([d_sum, d_mean], axis=1)
|
||||
expected.columns = ["sum", "mean"]
|
||||
tm.assert_frame_equal(result, expected, check_like=True)
|
||||
|
||||
result = grouped.agg([np.sum, np.mean])
|
||||
expected = pd.concat([c_sum, c_mean, d_sum, d_mean], axis=1)
|
||||
expected.columns = MultiIndex.from_product([["C", "D"], ["sum", "mean"]])
|
||||
tm.assert_frame_equal(result, expected, check_like=True)
|
||||
|
||||
result = grouped[["D", "C"]].agg([np.sum, np.mean])
|
||||
expected = pd.concat([d_sum, d_mean, c_sum, c_mean], axis=1)
|
||||
expected.columns = MultiIndex.from_product([["D", "C"], ["sum", "mean"]])
|
||||
tm.assert_frame_equal(result, expected, check_like=True)
|
||||
|
||||
result = grouped.agg({"C": "mean", "D": "sum"})
|
||||
expected = pd.concat([d_sum, c_mean], axis=1)
|
||||
tm.assert_frame_equal(result, expected, check_like=True)
|
||||
|
||||
result = grouped.agg({"C": ["mean", "sum"], "D": ["mean", "sum"]})
|
||||
expected = pd.concat([c_mean, c_sum, d_mean, d_sum], axis=1)
|
||||
expected.columns = MultiIndex.from_product([["C", "D"], ["mean", "sum"]])
|
||||
|
||||
msg = r"Column\(s\) \['r', 'r2'\] do not exist"
|
||||
with pytest.raises(KeyError, match=msg):
|
||||
grouped[["D", "C"]].agg({"r": np.sum, "r2": np.mean})
|
||||
|
||||
|
||||
def test_agg_dict_renaming_deprecation():
|
||||
# 15931
|
||||
df = DataFrame({"A": [1, 1, 1, 2, 2], "B": range(5), "C": range(5)})
|
||||
|
||||
msg = r"nested renamer is not supported"
|
||||
with pytest.raises(SpecificationError, match=msg):
|
||||
df.groupby("A").agg(
|
||||
{"B": {"foo": ["sum", "max"]}, "C": {"bar": ["count", "min"]}}
|
||||
)
|
||||
|
||||
msg = r"Column\(s\) \['ma'\] do not exist"
|
||||
with pytest.raises(KeyError, match=msg):
|
||||
df.groupby("A")[["B", "C"]].agg({"ma": "max"})
|
||||
|
||||
msg = r"nested renamer is not supported"
|
||||
with pytest.raises(SpecificationError, match=msg):
|
||||
df.groupby("A").B.agg({"foo": "count"})
|
||||
|
||||
|
||||
def test_agg_compat():
|
||||
# GH 12334
|
||||
df = DataFrame(
|
||||
{
|
||||
"A": ["foo", "bar", "foo", "bar", "foo", "bar", "foo", "foo"],
|
||||
"B": ["one", "one", "two", "two", "two", "two", "one", "two"],
|
||||
"C": np.random.randn(8) + 1.0,
|
||||
"D": np.arange(8),
|
||||
}
|
||||
)
|
||||
|
||||
g = df.groupby(["A", "B"])
|
||||
|
||||
msg = r"nested renamer is not supported"
|
||||
with pytest.raises(SpecificationError, match=msg):
|
||||
g["D"].agg({"C": ["sum", "std"]})
|
||||
|
||||
with pytest.raises(SpecificationError, match=msg):
|
||||
g["D"].agg({"C": "sum", "D": "std"})
|
||||
|
||||
|
||||
def test_agg_nested_dicts():
|
||||
# API change for disallowing these types of nested dicts
|
||||
df = DataFrame(
|
||||
{
|
||||
"A": ["foo", "bar", "foo", "bar", "foo", "bar", "foo", "foo"],
|
||||
"B": ["one", "one", "two", "two", "two", "two", "one", "two"],
|
||||
"C": np.random.randn(8) + 1.0,
|
||||
"D": np.arange(8),
|
||||
}
|
||||
)
|
||||
|
||||
g = df.groupby(["A", "B"])
|
||||
|
||||
msg = r"nested renamer is not supported"
|
||||
with pytest.raises(SpecificationError, match=msg):
|
||||
g.aggregate({"r1": {"C": ["mean", "sum"]}, "r2": {"D": ["mean", "sum"]}})
|
||||
|
||||
with pytest.raises(SpecificationError, match=msg):
|
||||
g.agg({"C": {"ra": ["mean", "std"]}, "D": {"rb": ["mean", "std"]}})
|
||||
|
||||
# same name as the original column
|
||||
# GH9052
|
||||
with pytest.raises(SpecificationError, match=msg):
|
||||
g["D"].agg({"result1": np.sum, "result2": np.mean})
|
||||
|
||||
with pytest.raises(SpecificationError, match=msg):
|
||||
g["D"].agg({"D": np.sum, "result2": np.mean})
|
||||
|
||||
|
||||
def test_agg_item_by_item_raise_typeerror():
|
||||
df = DataFrame(np.random.randint(10, size=(20, 10)))
|
||||
|
||||
def raiseException(df):
|
||||
pprint_thing("----------------------------------------")
|
||||
pprint_thing(df.to_string())
|
||||
raise TypeError("test")
|
||||
|
||||
with pytest.raises(TypeError, match="test"):
|
||||
with tm.assert_produces_warning(FutureWarning, match="Dropping invalid"):
|
||||
df.groupby(0).agg(raiseException)
|
||||
|
||||
|
||||
def test_series_agg_multikey():
|
||||
ts = tm.makeTimeSeries()
|
||||
grouped = ts.groupby([lambda x: x.year, lambda x: x.month])
|
||||
|
||||
result = grouped.agg(np.sum)
|
||||
expected = grouped.sum()
|
||||
tm.assert_series_equal(result, expected)
|
||||
|
||||
|
||||
def test_series_agg_multi_pure_python():
|
||||
data = DataFrame(
|
||||
{
|
||||
"A": [
|
||||
"foo",
|
||||
"foo",
|
||||
"foo",
|
||||
"foo",
|
||||
"bar",
|
||||
"bar",
|
||||
"bar",
|
||||
"bar",
|
||||
"foo",
|
||||
"foo",
|
||||
"foo",
|
||||
],
|
||||
"B": [
|
||||
"one",
|
||||
"one",
|
||||
"one",
|
||||
"two",
|
||||
"one",
|
||||
"one",
|
||||
"one",
|
||||
"two",
|
||||
"two",
|
||||
"two",
|
||||
"one",
|
||||
],
|
||||
"C": [
|
||||
"dull",
|
||||
"dull",
|
||||
"shiny",
|
||||
"dull",
|
||||
"dull",
|
||||
"shiny",
|
||||
"shiny",
|
||||
"dull",
|
||||
"shiny",
|
||||
"shiny",
|
||||
"shiny",
|
||||
],
|
||||
"D": np.random.randn(11),
|
||||
"E": np.random.randn(11),
|
||||
"F": np.random.randn(11),
|
||||
}
|
||||
)
|
||||
|
||||
def bad(x):
|
||||
assert len(x.values.base) > 0
|
||||
return "foo"
|
||||
|
||||
result = data.groupby(["A", "B"]).agg(bad)
|
||||
expected = data.groupby(["A", "B"]).agg(lambda x: "foo")
|
||||
tm.assert_frame_equal(result, expected)
|
||||
|
||||
|
||||
def test_agg_consistency():
|
||||
# agg with ([]) and () not consistent
|
||||
# GH 6715
|
||||
def P1(a):
|
||||
return np.percentile(a.dropna(), q=1)
|
||||
|
||||
df = DataFrame(
|
||||
{
|
||||
"col1": [1, 2, 3, 4],
|
||||
"col2": [10, 25, 26, 31],
|
||||
"date": [
|
||||
dt.date(2013, 2, 10),
|
||||
dt.date(2013, 2, 10),
|
||||
dt.date(2013, 2, 11),
|
||||
dt.date(2013, 2, 11),
|
||||
],
|
||||
}
|
||||
)
|
||||
|
||||
g = df.groupby("date")
|
||||
|
||||
expected = g.agg([P1])
|
||||
expected.columns = expected.columns.levels[0]
|
||||
|
||||
result = g.agg(P1)
|
||||
tm.assert_frame_equal(result, expected)
|
||||
|
||||
|
||||
def test_agg_callables():
|
||||
# GH 7929
|
||||
df = DataFrame({"foo": [1, 2], "bar": [3, 4]}).astype(np.int64)
|
||||
|
||||
class fn_class:
|
||||
def __call__(self, x):
|
||||
return sum(x)
|
||||
|
||||
equiv_callables = [
|
||||
sum,
|
||||
np.sum,
|
||||
lambda x: sum(x),
|
||||
lambda x: x.sum(),
|
||||
partial(sum),
|
||||
fn_class(),
|
||||
]
|
||||
|
||||
expected = df.groupby("foo").agg(sum)
|
||||
for ecall in equiv_callables:
|
||||
result = df.groupby("foo").agg(ecall)
|
||||
tm.assert_frame_equal(result, expected)
|
||||
|
||||
|
||||
def test_agg_over_numpy_arrays():
|
||||
# GH 3788
|
||||
df = DataFrame(
|
||||
[
|
||||
[1, np.array([10, 20, 30])],
|
||||
[1, np.array([40, 50, 60])],
|
||||
[2, np.array([20, 30, 40])],
|
||||
],
|
||||
columns=["category", "arraydata"],
|
||||
)
|
||||
gb = df.groupby("category")
|
||||
|
||||
expected_data = [[np.array([50, 70, 90])], [np.array([20, 30, 40])]]
|
||||
expected_index = Index([1, 2], name="category")
|
||||
expected_column = ["arraydata"]
|
||||
expected = DataFrame(expected_data, index=expected_index, columns=expected_column)
|
||||
|
||||
alt = gb.sum(numeric_only=False)
|
||||
tm.assert_frame_equal(alt, expected)
|
||||
|
||||
result = gb.agg("sum", numeric_only=False)
|
||||
tm.assert_frame_equal(result, expected)
|
||||
|
||||
# FIXME: the original version of this test called `gb.agg(sum)`
|
||||
# and that raises TypeError if `numeric_only=False` is passed
|
||||
|
||||
|
||||
@pytest.mark.parametrize("as_period", [True, False])
|
||||
def test_agg_tzaware_non_datetime_result(as_period):
|
||||
# discussed in GH#29589, fixed in GH#29641, operating on tzaware values
|
||||
# with function that is not dtype-preserving
|
||||
dti = date_range("2012-01-01", periods=4, tz="UTC")
|
||||
if as_period:
|
||||
dti = dti.tz_localize(None).to_period("D")
|
||||
|
||||
df = DataFrame({"a": [0, 0, 1, 1], "b": dti})
|
||||
gb = df.groupby("a")
|
||||
|
||||
# Case that _does_ preserve the dtype
|
||||
result = gb["b"].agg(lambda x: x.iloc[0])
|
||||
expected = Series(dti[::2], name="b")
|
||||
expected.index.name = "a"
|
||||
tm.assert_series_equal(result, expected)
|
||||
|
||||
# Cases that do _not_ preserve the dtype
|
||||
result = gb["b"].agg(lambda x: x.iloc[0].year)
|
||||
expected = Series([2012, 2012], name="b")
|
||||
expected.index.name = "a"
|
||||
tm.assert_series_equal(result, expected)
|
||||
|
||||
result = gb["b"].agg(lambda x: x.iloc[-1] - x.iloc[0])
|
||||
expected = Series([pd.Timedelta(days=1), pd.Timedelta(days=1)], name="b")
|
||||
expected.index.name = "a"
|
||||
if as_period:
|
||||
expected = Series([pd.offsets.Day(1), pd.offsets.Day(1)], name="b")
|
||||
expected.index.name = "a"
|
||||
tm.assert_series_equal(result, expected)
|
||||
|
||||
|
||||
def test_agg_timezone_round_trip():
|
||||
# GH 15426
|
||||
ts = pd.Timestamp("2016-01-01 12:00:00", tz="US/Pacific")
|
||||
df = DataFrame({"a": 1, "b": [ts + dt.timedelta(minutes=nn) for nn in range(10)]})
|
||||
|
||||
result1 = df.groupby("a")["b"].agg(np.min).iloc[0]
|
||||
result2 = df.groupby("a")["b"].agg(lambda x: np.min(x)).iloc[0]
|
||||
result3 = df.groupby("a")["b"].min().iloc[0]
|
||||
|
||||
assert result1 == ts
|
||||
assert result2 == ts
|
||||
assert result3 == ts
|
||||
|
||||
dates = [
|
||||
pd.Timestamp(f"2016-01-0{i:d} 12:00:00", tz="US/Pacific") for i in range(1, 5)
|
||||
]
|
||||
df = DataFrame({"A": ["a", "b"] * 2, "B": dates})
|
||||
grouped = df.groupby("A")
|
||||
|
||||
ts = df["B"].iloc[0]
|
||||
assert ts == grouped.nth(0)["B"].iloc[0]
|
||||
assert ts == grouped.head(1)["B"].iloc[0]
|
||||
assert ts == grouped.first()["B"].iloc[0]
|
||||
|
||||
# GH#27110 applying iloc should return a DataFrame
|
||||
assert ts == grouped.apply(lambda x: x.iloc[0]).iloc[0, 1]
|
||||
|
||||
ts = df["B"].iloc[2]
|
||||
assert ts == grouped.last()["B"].iloc[0]
|
||||
|
||||
# GH#27110 applying iloc should return a DataFrame
|
||||
assert ts == grouped.apply(lambda x: x.iloc[-1]).iloc[0, 1]
|
||||
|
||||
|
||||
def test_sum_uint64_overflow():
|
||||
# see gh-14758
|
||||
# Convert to uint64 and don't overflow
|
||||
df = DataFrame([[1, 2], [3, 4], [5, 6]], dtype=object)
|
||||
df = df + 9223372036854775807
|
||||
|
||||
index = Index(
|
||||
[9223372036854775808, 9223372036854775810, 9223372036854775812], dtype=np.uint64
|
||||
)
|
||||
expected = DataFrame(
|
||||
{1: [9223372036854775809, 9223372036854775811, 9223372036854775813]},
|
||||
index=index,
|
||||
)
|
||||
|
||||
expected.index.name = 0
|
||||
result = df.groupby(0).sum(numeric_only=False)
|
||||
tm.assert_frame_equal(result, expected)
|
||||
|
||||
# out column is non-numeric, so with numeric_only=True it is dropped
|
||||
result2 = df.groupby(0).sum(numeric_only=True)
|
||||
expected2 = expected[[]]
|
||||
tm.assert_frame_equal(result2, expected2)
|
||||
|
||||
|
||||
@pytest.mark.parametrize(
|
||||
"structure, expected",
|
||||
[
|
||||
(tuple, DataFrame({"C": {(1, 1): (1, 1, 1), (3, 4): (3, 4, 4)}})),
|
||||
(list, DataFrame({"C": {(1, 1): [1, 1, 1], (3, 4): [3, 4, 4]}})),
|
||||
(
|
||||
lambda x: tuple(x),
|
||||
DataFrame({"C": {(1, 1): (1, 1, 1), (3, 4): (3, 4, 4)}}),
|
||||
),
|
||||
(
|
||||
lambda x: list(x),
|
||||
DataFrame({"C": {(1, 1): [1, 1, 1], (3, 4): [3, 4, 4]}}),
|
||||
),
|
||||
],
|
||||
)
|
||||
def test_agg_structs_dataframe(structure, expected):
|
||||
df = DataFrame(
|
||||
{"A": [1, 1, 1, 3, 3, 3], "B": [1, 1, 1, 4, 4, 4], "C": [1, 1, 1, 3, 4, 4]}
|
||||
)
|
||||
|
||||
result = df.groupby(["A", "B"]).aggregate(structure)
|
||||
expected.index.names = ["A", "B"]
|
||||
tm.assert_frame_equal(result, expected)
|
||||
|
||||
|
||||
@pytest.mark.parametrize(
|
||||
"structure, expected",
|
||||
[
|
||||
(tuple, Series([(1, 1, 1), (3, 4, 4)], index=[1, 3], name="C")),
|
||||
(list, Series([[1, 1, 1], [3, 4, 4]], index=[1, 3], name="C")),
|
||||
(lambda x: tuple(x), Series([(1, 1, 1), (3, 4, 4)], index=[1, 3], name="C")),
|
||||
(lambda x: list(x), Series([[1, 1, 1], [3, 4, 4]], index=[1, 3], name="C")),
|
||||
],
|
||||
)
|
||||
def test_agg_structs_series(structure, expected):
|
||||
# Issue #18079
|
||||
df = DataFrame(
|
||||
{"A": [1, 1, 1, 3, 3, 3], "B": [1, 1, 1, 4, 4, 4], "C": [1, 1, 1, 3, 4, 4]}
|
||||
)
|
||||
|
||||
result = df.groupby("A")["C"].aggregate(structure)
|
||||
expected.index.name = "A"
|
||||
tm.assert_series_equal(result, expected)
|
||||
|
||||
|
||||
def test_agg_category_nansum(observed):
|
||||
categories = ["a", "b", "c"]
|
||||
df = DataFrame(
|
||||
{"A": pd.Categorical(["a", "a", "b"], categories=categories), "B": [1, 2, 3]}
|
||||
)
|
||||
result = df.groupby("A", observed=observed).B.agg(np.nansum)
|
||||
expected = Series(
|
||||
[3, 3, 0],
|
||||
index=pd.CategoricalIndex(["a", "b", "c"], categories=categories, name="A"),
|
||||
name="B",
|
||||
)
|
||||
if observed:
|
||||
expected = expected[expected != 0]
|
||||
tm.assert_series_equal(result, expected)
|
||||
|
||||
|
||||
def test_agg_list_like_func():
|
||||
# GH 18473
|
||||
df = DataFrame({"A": [str(x) for x in range(3)], "B": [str(x) for x in range(3)]})
|
||||
grouped = df.groupby("A", as_index=False, sort=False)
|
||||
result = grouped.agg({"B": lambda x: list(x)})
|
||||
expected = DataFrame(
|
||||
{"A": [str(x) for x in range(3)], "B": [[str(x)] for x in range(3)]}
|
||||
)
|
||||
tm.assert_frame_equal(result, expected)
|
||||
|
||||
|
||||
def test_agg_lambda_with_timezone():
|
||||
# GH 23683
|
||||
df = DataFrame(
|
||||
{
|
||||
"tag": [1, 1],
|
||||
"date": [
|
||||
pd.Timestamp("2018-01-01", tz="UTC"),
|
||||
pd.Timestamp("2018-01-02", tz="UTC"),
|
||||
],
|
||||
}
|
||||
)
|
||||
result = df.groupby("tag").agg({"date": lambda e: e.head(1)})
|
||||
expected = DataFrame(
|
||||
[pd.Timestamp("2018-01-01", tz="UTC")],
|
||||
index=Index([1], name="tag"),
|
||||
columns=["date"],
|
||||
)
|
||||
tm.assert_frame_equal(result, expected)
|
||||
|
||||
|
||||
@pytest.mark.parametrize(
|
||||
"err_cls",
|
||||
[
|
||||
NotImplementedError,
|
||||
RuntimeError,
|
||||
KeyError,
|
||||
IndexError,
|
||||
OSError,
|
||||
ValueError,
|
||||
ArithmeticError,
|
||||
AttributeError,
|
||||
],
|
||||
)
|
||||
def test_groupby_agg_err_catching(err_cls):
|
||||
# make sure we suppress anything other than TypeError or AssertionError
|
||||
# in _python_agg_general
|
||||
|
||||
# Use a non-standard EA to make sure we don't go down ndarray paths
|
||||
from pandas.tests.extension.decimal.array import (
|
||||
DecimalArray,
|
||||
make_data,
|
||||
to_decimal,
|
||||
)
|
||||
|
||||
data = make_data()[:5]
|
||||
df = DataFrame(
|
||||
{"id1": [0, 0, 0, 1, 1], "id2": [0, 1, 0, 1, 1], "decimals": DecimalArray(data)}
|
||||
)
|
||||
|
||||
expected = Series(to_decimal([data[0], data[3]]))
|
||||
|
||||
def weird_func(x):
|
||||
# weird function that raise something other than TypeError or IndexError
|
||||
# in _python_agg_general
|
||||
if len(x) == 0:
|
||||
raise err_cls
|
||||
return x.iloc[0]
|
||||
|
||||
result = df["decimals"].groupby(df["id1"]).agg(weird_func)
|
||||
tm.assert_series_equal(result, expected, check_names=False)
|
||||
Reference in New Issue
Block a user