matplotlib · tacaswell · Aug 3, 2023 · Aug 3, 2023 · Aug 3, 2023 · Aug 3, 2023
diff --git a/doc/api/next_api_changes/deprecations/26444-ES.rst b/doc/api/next_api_changes/deprecations/26444-ES.rst
@@ -0,0 +1,5 @@
+Passing non-int or sequence of non-int to ``Table.auto_set_column_width``
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Column numbers are ints, and formerly passing any other type was effectively
+ignored. This will become an error in the future.
diff --git a/lib/matplotlib/_mathtext.py b/lib/matplotlib/_mathtext.py
@@ -243,14 +243,6 @@ def get_underline_thickness(self, font, fontsize, dpi):
         """
         raise NotImplementedError()
 
-    def get_used_characters(self):
-        """
-        Get the set of characters that were used in the math
-        expression.  Used by backends that need to subset fonts so
-        they know which glyphs to include.
-        """
-        return self.used_characters
-
     def get_sized_alternatives_for_symbol(self, fontname, sym):
         """
         Override if your font provides multiple sizes of the same

diff --git a/lib/matplotlib/table.py b/lib/matplotlib/table.py
@@ -24,6 +24,8 @@
 Thanks to John Gill for providing the class and table.
 """
 
+import numpy as np
+
 from . import _api, _docstring
 from .artist import Artist, allow_rasterization
 from .patches import Rectangle
@@ -494,14 +496,15 @@ def auto_set_column_width(self, col):
         col : int or sequence of ints
             The indices of the columns to auto-scale.
         """
-        # check for col possibility on iteration
-        try:
-            iter(col)
-        except (TypeError, AttributeError):
-            self._autoColumns.append(col)
-        else:
-            for cell in col:
-                self._autoColumns.append(cell)
+        col1d = np.atleast_1d(col)
+        if not np.issubdtype(col1d.dtype, np.integer):
+            _api.warn_deprecated("3.8", name="col",
+                                 message="%(name)r must be an int or sequence of ints. "
+                                 "Passing other types is deprecated since %(since)s "
+                                 "and will be removed %(removal)s.")
+            return
+        for cell in col1d:
+            self._autoColumns.append(cell)
 
         self.stale = True
 

diff --git a/lib/matplotlib/tests/test_dviread.py b/lib/matplotlib/tests/test_dviread.py
@@ -7,7 +7,7 @@
 
 
 def test_PsfontsMap(monkeypatch):
-    monkeypatch.setattr(dr, 'find_tex_file', lambda x: x)
+    monkeypatch.setattr(dr, 'find_tex_file', lambda x: x.decode())
 
     filename = str(Path(__file__).parent / 'baseline_images/dviread/test.map')
     fontmap = dr.PsfontsMap(filename)
@@ -18,15 +18,15 @@ def test_PsfontsMap(monkeypatch):
         assert entry.texname == key
         assert entry.psname == b'PSfont%d' % n
         if n not in [3, 5]:
-            assert entry.encoding == b'font%d.enc' % n
+            assert entry.encoding == 'font%d.enc' % n
         elif n == 3:
-            assert entry.encoding == b'enc3.foo'
+            assert entry.encoding == 'enc3.foo'
         # We don't care about the encoding of TeXfont5, which specifies
         # multiple encodings.
         if n not in [1, 5]:
-            assert entry.filename == b'font%d.pfa' % n
+            assert entry.filename == 'font%d.pfa' % n
         else:
-            assert entry.filename == b'font%d.pfb' % n
+            assert entry.filename == 'font%d.pfb' % n
         if n == 4:
             assert entry.effects == {'slant': -0.1, 'extend': 1.2}
         else:
@@ -37,13 +37,13 @@ def test_PsfontsMap(monkeypatch):
     assert entry.encoding is None
     entry = fontmap[b'TeXfont7']
     assert entry.filename is None
-    assert entry.encoding == b'font7.enc'
+    assert entry.encoding == 'font7.enc'
     entry = fontmap[b'TeXfont8']
-    assert entry.filename == b'font8.pfb'
+    assert entry.filename == 'font8.pfb'
     assert entry.encoding is None
     entry = fontmap[b'TeXfont9']
     assert entry.psname == b'TeXfont9'
-    assert entry.filename == b'/absolute/font9.pfb'
+    assert entry.filename == '/absolute/font9.pfb'
     # First of duplicates only.
     entry = fontmap[b'TeXfontA']
     assert entry.psname == b'PSfontA1'

diff --git a/lib/matplotlib/tests/test_table.py b/lib/matplotlib/tests/test_table.py
@@ -1,9 +1,11 @@
-import matplotlib.pyplot as plt
 import numpy as np
-from matplotlib.testing.decorators import image_comparison, check_figures_equal
+import pytest
 
-from matplotlib.table import CustomCell, Table
+import matplotlib.pyplot as plt
+import matplotlib as mpl
 from matplotlib.path import Path
+from matplotlib.table import CustomCell, Table
+from matplotlib.testing.decorators import image_comparison, check_figures_equal
 from matplotlib.transforms import Bbox
 
 
@@ -176,7 +178,12 @@ def test_auto_column():
         loc="center")
     tb4.auto_set_font_size(False)
     tb4.set_fontsize(12)
-    tb4.auto_set_column_width("-101")
+    with pytest.warns(mpl.MatplotlibDeprecationWarning,
+                      match="'col' must be an int or sequence of ints"):
+        tb4.auto_set_column_width("-101")  # type: ignore [arg-type]
+    with pytest.warns(mpl.MatplotlibDeprecationWarning,
+                      match="'col' must be an int or sequence of ints"):
+        tb4.auto_set_column_width(["-101"])  # type: ignore [list-item]
 
 
 def test_table_cells():