Backport PR #35588: BUG: fix styler cell_ids arg so that blank style is ignored on False (#35619)

Co-authored-by: attack68 <[email protected]>

Author: meeseeksmachine

doc/source/whatsnew/v1.1.1.rst

@@ -27,6 +27,7 @@ Fixed regressions
 Bug fixes
 ~~~~~~~~~
 
+- Bug in ``Styler`` whereby `cell_ids` argument had no effect due to other recent changes (:issue:`35588`).
 
 Categorical
 ^^^^^^^^^^^

pandas/io/formats/style.py

@@ -390,7 +390,7 @@ def format_attr(pair):
                     "is_visible": (c not in hidden_columns),
                 }
                 # only add an id if the cell has a style
-                if self.cell_ids or not (len(ctx[r, c]) == 1 and ctx[r, c][0] == ""):
+                if self.cell_ids or (r, c) in ctx:
                     row_dict["id"] = "_".join(cs[1:])
                 row_es.append(row_dict)
                 props = []

pandas/tests/io/formats/test_style.py

@@ -1682,6 +1682,12 @@ def f(a, b, styler):
         result = styler.pipe((f, "styler"), a=1, b=2)
         assert result == (1, 2, styler)
 
+    def test_no_cell_ids(self):
+        # GH 35588
+        df = pd.DataFrame(data=[[0]])
+        s = Styler(df, uuid="_", cell_ids=False).render()
+        assert s.find('<td  class="data row0 col0" >') != -1
+
 
 @td.skip_if_no_mpl
 class TestStylerMatplotlibDep: