BUG: Styler hidden elements sparse none

doc/source/whatsnew/v1.4.0.rst

@@ -440,7 +440,7 @@ Styler
 - Bug in :meth:`Styler.apply` where functions which returned Series objects were not correctly handled in terms of aligning their index labels (:issue:`13657`, :issue:`42014`)
 - Bug when rendering an empty DataFrame with a named index (:issue:`43305`).
 - Bug when rendering a single level MultiIndex (:issue:`43383`).
-- Bug when combining non-sparse rendering and :meth:`.Styler.hide_columns` (:issue:`43464`)
+- Bug when combining non-sparse rendering and :meth:`.Styler.hide_columns` or :meth:`.Styler.hide_index` (:issue:`43464`)
 
 Other
 ^^^^^

pandas/io/formats/style_render.py

@@ -375,8 +375,7 @@ def _translate_header(
                             "th",
                             f"{col_heading_class} level{r} col{c}",
                             value,
-                            _is_visible(c, r, col_lengths)
-                            and c not in self.hidden_columns,
+                            _is_visible(c, r, col_lengths),
                             attributes=(
                                 f'colspan="{col_lengths.get((r, c), 0)}"'
                                 if col_lengths.get((r, c), 0) > 1
@@ -534,7 +533,7 @@ def _translate_body(
                     "th",
                     f"{row_heading_class} level{c} row{r}",
                     value,
-                    (_is_visible(r, c, idx_lengths) and not self.hide_index_[c]),
+                    _is_visible(r, c, idx_lengths) and not self.hide_index_[c],
                     attributes=(
                         f'rowspan="{idx_lengths.get((c, r), 0)}"'
                         if idx_lengths.get((c, r), 0) > 1
@@ -948,7 +947,8 @@ def _get_level_lengths(
                 # stop the loop due to display trimming
                 break
             if not sparsify:
-                lengths[(i, j)] = 1
+                if j not in hidden_elements:
+                    lengths[(i, j)] = 1
             elif (row is not lib.no_default) and (j not in hidden_elements):
                 last_label = j
                 lengths[(i, last_label)] = 1

pandas/tests/io/formats/style/test_style.py

@@ -1477,12 +1477,44 @@ def test_caption_raises(mi_styler, caption):
         mi_styler.set_caption(caption)
 
 
-def test_no_sparse_hiding_columns():
+@pytest.mark.parametrize("axis", ["index", "columns"])
+def test_hiding_headers_over_axis_no_sparsify(axis):
     # GH 43464
     midx = MultiIndex.from_product([[1, 2], ["a", "a", "b"]])
-    df = DataFrame(9, index=[0], columns=midx)
-    styler = df.style.hide_columns((1, "a"))
+    df = DataFrame(
+        9,
+        index=midx if axis == "index" else [0],
+        columns=midx if axis == "columns" else [0],
+    )
+
+    styler = getattr(df.style, f"hide_{axis}")((1, "a"))
     ctx = styler._translate(False, False)
 
-    for ix in [(0, 1), (0, 2), (1, 1), (1, 2)]:
-        assert ctx["head"][ix[0]][ix[1]]["is_visible"] is False
+    if axis == "columns":  # test column headers
+        for ix in [(0, 1), (0, 2), (1, 1), (1, 2)]:
+            assert ctx["head"][ix[0]][ix[1]]["is_visible"] is False
+    if axis == "index":  # test row headers
+        for ix in [(0, 0), (0, 1), (1, 0), (1, 1)]:
+            assert ctx["body"][ix[0]][ix[1]]["is_visible"] is False
+
+
+def test_get_level_lengths_mi_hidden():
+    # GH 43464
+    index = MultiIndex.from_arrays([[1, 1, 1, 2, 2, 2], ["a", "a", "b", "a", "a", "b"]])
+    expected = {
+        (0, 2): 1,
+        (0, 3): 1,
+        (0, 4): 1,
+        (0, 5): 1,
+        (1, 2): 1,
+        (1, 3): 1,
+        (1, 4): 1,
+        (1, 5): 1,
+    }
+    result = _get_level_lengths(
+        index,
+        sparsify=False,
+        max_index=100,
+        hidden_elements=[0, 1, 0, 1],  # hidden element can repeat if duplicated index
+    )
+    tm.assert_dict_equal(result, expected)