def test_default_groups(self, df, orient):
other = {"x": "y", "y": "x"}[orient]
gb = GroupBy(["grp2"])
res = Norm()(df, gb, orient)
for _, grp in res.groupby("grp2"):
assert grp[other].max() == pytest.approx(1)
def test_apply_no_grouper(df):
df = df[["x", "y"]]
res = GroupBy(["a"]).apply(df, lambda x: x.sort_values("x"))
assert_array_equal(res.columns, ["x", "y"])
assert_array_equal(res["x"], df["x"].sort_values())
assert_array_equal(res["y"], df.loc[np.argsort(df["x"]), "y"])
def test_agg_one_grouper(df):
res = GroupBy(["a"]).agg(df, {"y": "max"})
assert_array_equal(res.index, [0, 1])
assert_array_equal(res.columns, ["a", "y"])
assert_array_equal(res["a"], ["a", "b"])
assert_array_equal(res["y"], [.8, .5])
def __call__(self, data: DataFrame, groupby: GroupBy,
orient: str) -> DataFrame:
# TODO where to ensure that other semantic variables are sorted properly?
# TODO why are we not using the passed in groupby here?
groupers = ["col", "row", orient]
return GroupBy(groupers).apply(data, self._stack, orient)
def test_faceted(self, toy_df_facets):
groupby = GroupBy(["color", "group"])
res = Stack()(toy_df_facets, groupby, "x")
assert_array_equal(res["x"], [0, 0, 1, 0, 1, 2])
assert_array_equal(res["y"], [1, 3, 3, 1, 2, 3])
assert_array_equal(res["baseline"], [0, 1, 0, 0, 0, 0])
def test_basic(self, toy_df):
groupby = GroupBy(["color", "group"])
res = Stack()(toy_df, groupby, "x")
assert_array_equal(res["x"], [0, 0, 1])
assert_array_equal(res["y"], [1, 3, 3])
assert_array_equal(res["baseline"], [0, 1, 0])
def test_faceted_drop(self, toy_df_facets):
groupby = GroupBy(["x", "grp", "col"])
res = Dodge(empty="drop")(toy_df_facets, groupby, "x")
assert_array_equal(res["y"], [1, 2, 3, 1, 2, 3])
assert_array_almost_equal(res["x"], [-.2, .2, 1, 0, 1, 2])
assert_array_almost_equal(res["width"], [.4] * 6)
def test_faceted_default(self, toy_df_facets):
groupby = GroupBy(["x", "grp", "col"])
res = Dodge()(toy_df_facets, groupby, "x")
assert_array_equal(res["y"], [1, 2, 3, 1, 2, 3])
assert_array_almost_equal(res["x"], [-.2, .2, .8, .2, .8, 2.2])
assert_array_almost_equal(res["width"], [.4] * 6)
def test_widths_drop(self, toy_df_widths):
groupby = GroupBy(["x", "grp"])
res = Dodge(empty="drop")(toy_df_widths, groupby, "x")
assert_array_equal(res["y"], [1, 2, 3])
assert_array_almost_equal(res["x"], [-.08, .32, 1])
assert_array_almost_equal(res["width"], [.64, .16, .2])
def test_gap(self, toy_df):
groupby = GroupBy(["x", "grp"])
res = Dodge(gap=.25)(toy_df, groupby, "x")
assert_array_equal(res["y"], [1, 2, 3])
assert_array_almost_equal(res["x"], [-.2, .2, 1.2])
assert_array_almost_equal(res["width"], [.3, .3, .3])
def test_drop(self, toy_df):
groupby = GroupBy(["x", "grp"])
res = Dodge("drop")(toy_df, groupby, "x")
assert_array_equal(res["y"], [1, 2, 3])
assert_array_almost_equal(res["x"], [-.2, .2, 1])
assert_array_almost_equal(res["width"], [.4, .4, .4])
def test_baseline_homogeneity_check(self, toy_df):
toy_df["baseline"] = [0, 1, 2]
groupby = GroupBy(["color", "group"])
move = Stack()
err = "Stack move cannot be used when baselines"
with pytest.raises(RuntimeError, match=err):
move(toy_df, groupby, "x")
def test_apply_one_grouper(df):
res = GroupBy(["a"]).apply(df, lambda x: x.sort_values("x"))
assert_array_equal(res.index, [0, 1, 2, 3, 4])
assert_array_equal(res.columns, ["a", "b", "x", "y"])
assert_array_equal(res["a"], ["a", "a", "a", "b", "b"])
assert_array_equal(res["b"], ["g", "h", "f", "f", "h"])
assert_array_equal(res["x"], [1, 1, 2, 2, 3])
def triple_args(self):
groupby = GroupBy(["group", "a", "s"])
class Scale:
scale_type = "continuous"
return groupby, "x", {"x": Scale()}
def test_fill(self, toy_df):
groupby = GroupBy(["x", "grp"])
res = Dodge(empty="fill")(toy_df, groupby, "x")
assert_array_equal(res["y"], [1, 2, 3]),
assert_array_almost_equal(res["x"], [-.2, .2, 1])
assert_array_almost_equal(res["width"], [.4, .4, .8])
def test_agg_two_groupers(df):
res = GroupBy(["a", "x"]).agg(df, {"y": "min"})
assert_array_equal(res.index, [0, 1, 2, 3, 4, 5])
assert_array_equal(res.columns, ["a", "x", "y"])
assert_array_equal(res["a"], ["a", "a", "a", "b", "b", "b"])
assert_array_equal(res["x"], [1, 2, 3, 1, 2, 3])
assert_array_equal(res["y"], [.2, .8, np.nan, np.nan, .4, .5])
def test_orient(self, toy_df):
df = toy_df.assign(x=toy_df["y"], y=toy_df["x"])
groupby = GroupBy(["y", "grp"])
res = Dodge("drop")(df, groupby, "y")
assert_array_equal(res["x"], [1, 2, 3])
assert_array_almost_equal(res["y"], [-.2, .2, 1])
assert_array_almost_equal(res["width"], [.4, .4, .4])
def test_no_grouper(self, df):
groupby = GroupBy(["group"])
res = PolyFit(order=1, gridsize=100)(df[["x", "y"]], groupby, "x", {})
assert_array_equal(res.columns, ["x", "y"])
grid = np.linspace(df["x"].min(), df["x"].max(), 100)
assert_array_equal(res["x"], grid)
assert_array_almost_equal(res["y"].diff().diff().dropna(),
np.zeros(grid.size - 2))
def test_agg_two_groupers_ordered(df):
order = {"b": ["h", "g", "f"], "x": [3, 2, 1]}
res = GroupBy(order).agg(df, {"a": "min", "y": lambda x: x.iloc[0]})
assert_array_equal(res.index, [0, 1, 2, 3, 4, 5, 6, 7, 8])
assert_array_equal(res.columns, ["a", "b", "x", "y"])
assert_array_equal(res["b"], ["h", "h", "h", "g", "g", "g", "f", "f", "f"])
assert_array_equal(res["x"], [3, 2, 1, 3, 2, 1, 3, 2, 1])
T, F = True, False
assert_array_equal(res["a"].isna(), [F, T, F, T, T, F, T, F, T])
assert_array_equal(res["a"].dropna(), ["b", "a", "a", "a"])
assert_array_equal(res["y"].dropna(), [.5, .3, .2, .8])
def __call__(self, data, groupby, orient, scales):
# TODO better to do this as an isinstance check?
# We are only asking about Nominal scales now,
# but presumably would apply to Ordinal too?
scale_type = scales[orient].__class__.__name__.lower()
grouping_vars = [v for v in data if v in groupby.order]
if not grouping_vars or self.common_bins is True:
bin_kws = self._define_bin_params(data, orient, scale_type)
data = groupby.apply(data, self._eval, orient, bin_kws)
else:
if self.common_bins is False:
bin_groupby = GroupBy(grouping_vars)
else:
bin_groupby = GroupBy(self.common_bins)
data = bin_groupby.apply(
data,
self._get_bins_and_eval,
orient,
groupby,
scale_type,
)
# TODO Make this an option?
# (This needs to be tested if enabled, and maybe should be in _eval)
# other = {"x": "y", "y": "x"}[orient]
# data = data[data[other] > 0]
if not grouping_vars or self.common_norm is True:
data = self._normalize(data, orient)
else:
if self.common_norm is False:
norm_grouper = grouping_vars
else:
norm_grouper = self.common_norm
normalize = partial(self._normalize, orient=orient)
data = GroupBy(norm_grouper).apply(data, normalize)
return data
def test_apply_replace_columns(df):
def add_sorted_cumsum(df):
x = df["x"].sort_values()
z = df.loc[x.index, "y"].cumsum()
return pd.DataFrame(dict(x=x.values, z=z.values))
res = GroupBy(["a"]).apply(df, add_sorted_cumsum)
assert_array_equal(res.index, df.index)
assert_array_equal(res.columns, ["a", "x", "z"])
assert_array_equal(res["a"], ["a", "a", "a", "b", "b"])
assert_array_equal(res["x"], [1, 1, 2, 2, 3])
assert_array_equal(res["z"], [.2, .5, 1.3, .4, .9])
def test_one_grouper(self, df):
groupby = GroupBy(["group"])
gridsize = 50
res = PolyFit(gridsize=gridsize)(df, groupby, "x", {})
assert res.columns.to_list() == ["x", "y", "group"]
ngroups = df["group"].nunique()
assert_array_equal(res.index, np.arange(ngroups * gridsize))
for _, part in res.groupby("group"):
grid = np.linspace(part["x"].min(), part["x"].max(), gridsize)
assert_array_equal(part["x"], grid)
assert part["y"].diff().diff().dropna().abs().gt(0).all()
def __call__(self, data, groupby, orient, scales):
scale_type = scales[orient].scale_type
grouping_vars = [v for v in data if v in groupby.order]
if not grouping_vars or self.common_bins is True:
bin_kws = self._define_bin_params(data, orient, scale_type)
data = groupby.apply(data, self._eval, orient, bin_kws)
else:
if self.common_bins is False:
bin_groupby = GroupBy(grouping_vars)
else:
bin_groupby = GroupBy(self.common_bins)
data = bin_groupby.apply(
data,
self._get_bins_and_eval,
orient,
groupby,
scale_type,
)
# TODO Make this an option?
# (This needs to be tested if enabled, and maybe should be in _eval)
# other = {"x": "y", "y": "x"}[orient]
# data = data[data[other] > 0]
if not grouping_vars or self.common_norm is True:
data = self._normalize(data, orient)
else:
if self.common_norm is False:
norm_grouper = grouping_vars
else:
norm_grouper = self.common_norm
normalize = partial(self._normalize, orient=orient)
data = GroupBy(norm_grouper).apply(data, normalize)
return data
def test_single_semantic(self, df, grp):
groupby = GroupBy(["x", grp])
res = Dodge()(df, groupby, "x")
levels = categorical_order(df[grp])
w, n = 0.8, len(levels)
shifts = np.linspace(0, w - w / n, n)
shifts -= shifts.mean()
assert_series_equal(res["y"], df["y"])
assert_series_equal(res["width"], df["width"] / n)
for val, shift in zip(levels, shifts):
rows = df[grp] == val
assert_series_equal(res.loc[rows, "x"], df.loc[rows, "x"] + shift)
def test_two_semantics(self, df):
groupby = GroupBy(["x", "grp2", "grp3"])
res = Dodge()(df, groupby, "x")
levels = categorical_order(df["grp2"]), categorical_order(df["grp3"])
w, n = 0.8, len(levels[0]) * len(levels[1])
shifts = np.linspace(0, w - w / n, n)
shifts -= shifts.mean()
assert_series_equal(res["y"], df["y"])
assert_series_equal(res["width"], df["width"] / n)
for (v2, v3), shift in zip(product(*levels), shifts):
rows = (df["grp2"] == v2) & (df["grp3"] == v3)
assert_series_equal(res.loc[rows, "x"], df.loc[rows, "x"] + shift)
def test_apply_mutate_columns(df):
xx = np.arange(0, 5)
hats = []
def polyfit(df):
fit = np.polyfit(df["x"], df["y"], 1)
hat = np.polyval(fit, xx)
hats.append(hat)
return pd.DataFrame(dict(x=xx, y=hat))
res = GroupBy(["a"]).apply(df, polyfit)
assert_array_equal(res.index, np.arange(xx.size * 2))
assert_array_equal(res.columns, ["a", "x", "y"])
assert_array_equal(res["a"], ["a"] * xx.size + ["b"] * xx.size)
assert_array_equal(res["x"], xx.tolist() + xx.tolist())
assert_array_equal(res["y"], np.concatenate(hats))
def get_groupby(self, df, orient):
other = {"x": "y", "y": "x"}[orient]
cols = [c for c in df if c != other]
return GroupBy(cols)
def test_init_requires_order():
with pytest.raises(ValueError, match="GroupBy requires at least one"):
GroupBy([])
def test_init_from_dict():
order = {"a": [3, 2, 1], "c": None, "b": ["x", "y", "z"]}
g = GroupBy(order)
assert g.order == order
def test_at_least_one_grouping_variable_required(df):
with pytest.raises(ValueError, match="No grouping variables are present"):
GroupBy(["z"]).agg(df, x="mean")