has2k1 · has2k1 · Jun 13, 2026 · Jun 12, 2026 · Jun 12, 2026 · Jun 12, 2026
diff --git a/.github/workflows/testing.yml b/.github/workflows/testing.yml
@@ -24,7 +24,7 @@ jobs:
     strategy:
       matrix:
         include:
-          - python-version: "3.10"
+          - python-version: "3.11"
             resolution: "lowest-direct"
           - python-version: 3.14
             resolution: "highest"

diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
@@ -7,3 +7,12 @@ repos:
         args: [--select=I001, --fix]
       # Run the formatter.
       - id: ruff-format
+  - repo: local
+    hooks:
+      # Requires the oxipng binary on PATH:
+      #   brew install oxipng  (or: cargo install oxipng)
+      - id: oxipng
+        name: optimize baseline images
+        entry: oxipng -o 4 --strip safe
+        language: system
+        files: ^tests/baseline_images/.*\.png$
diff --git a/README.md b/README.md
@@ -138,6 +138,7 @@ Development version
 
 ```console
 $ pip install git+https://github.com/has2k1/plotnine.git
+$ brew install oxipng   # Test image optimiser (OR `cargo install oxipng`)
 ```
 
 ## Contributing

diff --git a/doc/changelog.qmd b/doc/changelog.qmd
@@ -91,6 +91,13 @@ title: Changelog
 
 ### Enhancements
 
+- The `factor` function available when evaluating expressions in
+  [](:class:`~plotnine.aes`) now accepts a scalar value.
+
+  ```python
+  ggplot(mtcars, aes("wt", "mpg", color="factor(4)")) + geom_point()
+  ```
+
 - Increased the default linespacing used by themes from `0.9` to `1.2`.
   This gives multiline titles, subtitles and captions a better balance between looking compact and looking crumpled.
 

diff --git a/plotnine/_utils/context.py b/plotnine/_utils/context.py
@@ -126,8 +126,9 @@ def __post_init__(self):
         # https://github.com/matplotlib/matplotlib/issues/24644
         # When drawing the Composition, the dpi themeable is infective
         # because it sets the rcParam after this figure is created.
-        rcParams = {"figure.dpi": self.cmp.theme.getp("dpi")}
-        self._rc_context = mpl.rc_context(rcParams)
+        self._rc_context = mpl.rc_context(
+            {"figure.dpi": self.cmp.theme.getp("dpi")}
+        )
 
     def __enter__(self) -> Self:
         """

diff --git a/plotnine/mapping/_eval_environment.py b/plotnine/mapping/_eval_environment.py
@@ -23,7 +23,7 @@
 
 
 def factor(
-    values: Sequence[Any],
+    values: Sequence[Any] | float | str,
     categories: Sequence[Any] | None = None,
     ordered: bool | None = None,
 ) -> pd.Categorical:
@@ -48,6 +48,9 @@ def factor(
         `categories` attribute (which in turn is the `categories` argument, if
         provided).
     """
+    if isinstance(values, (int, float, str)):
+        values = [values]
+
     return pd.Categorical(values, categories=categories, ordered=None)  # pyright: ignore[reportReturnType]
 
 

diff --git a/plotnine/themes/elements/element_text.py b/plotnine/themes/elements/element_text.py
@@ -48,7 +48,7 @@ class element_text(element_base):
         the text then align the bounding box of the rotated text.
         If `"anchor"`, first align the unrotated text then rotate the
         text around the point of alignment.
-    linespacing : float
+    linespacing :
         Line spacing
     backgroundcolor :
         Background color
@@ -111,7 +111,7 @@ def __init__(
             | Sequence[float]
             | None
         ) = None,
-        linespacing: float | None = None,
+        linespacing: float | Literal["normal"] | None = None,
         backgroundcolor: (
             str
             | tuple[float, float, float]

diff --git a/plotnine/themes/theme.py b/plotnine/themes/theme.py
@@ -222,13 +222,12 @@ def __init__(
         svg_usefonts=None,
         **kwargs,
     ):
+        import matplotlib as mpl
+
         self.themeables = Themeables()
         self.complete = complete
 
-        if complete:
-            self._rcParams = deepcopy(DEFAULT_RCPARAMS)
-        else:
-            self._rcParams = {}
+        self._rcParams = mpl.RcParams(DEFAULT_RCPARAMS if complete else {})
 
         # Themeables
         official_themeables = themeable.registry()

diff --git a/plotnine/themes/theme_gray.py b/plotnine/themes/theme_gray.py
@@ -47,7 +47,7 @@ def __init__(self, base_size=11, base_family=None):
                 color="black",
                 ma="center",
                 size=base_size,
-                linespacing=1.2,
+                linespacing="normal",
                 rotation=0,
                 margin=margin(),
             ),
@@ -147,7 +147,6 @@ def __init__(self, base_size=11, base_family=None):
             strip_text=element_text(
                 color="#1A1A1A",
                 size=base_size * 0.8,
-                linespacing=1.5,
                 margin=margin_auto(half_line * 0.8),
             ),
             strip_text_y=element_text(rotation=-90),

diff --git a/plotnine/themes/theme_matplotlib.py b/plotnine/themes/theme_matplotlib.py
@@ -40,13 +40,16 @@ def __init__(self, rc=None, fname=None, use_defaults=True):
             line=element_line(size=linewidth),
             rect=element_rect(size=linewidth),
             text=element_text(
+                ma="center",
                 size=base_size,
-                linespacing=1,
+                linespacing="normal",
                 rotation=0,
-                margin={},
+                margin=margin(),
             ),
             aspect_ratio=get_option("aspect_ratio"),
-            axis_text=element_text(margin=margin(t=2.4, r=2.4, unit="pt")),
+            axis_text=element_text(
+                size=base_size * 0.8, margin=margin(t=2.4, r=2.4, unit="pt")
+            ),
             axis_title_x=element_text(
                 va="bottom", ha="center", margin=margin(t=m, unit="fig")
             ),
@@ -65,12 +68,15 @@ def __init__(self, rc=None, fname=None, use_defaults=True):
             legend_key_spacing_x=6,
             legend_key_spacing_y=2,
             legend_frame=element_rect(color="black"),
-            legend_key_size=16,
+            legend_key_size=base_size * 0.8 * 1.8,
             legend_ticks_length=0.2,
             legend_margin=0,
             legend_position="right",
             legend_spacing=10,
-            legend_text=element_text(margin=margin_auto(m / 2, unit="fig")),
+            legend_text=element_text(
+                size=base_size * 0.8,
+                margin=margin_auto(m / 1.5, unit="fig"),
+            ),
             legend_ticks=element_line(color="black"),
             legend_title=element_text(
                 ha="left",
@@ -80,27 +86,29 @@ def __init__(self, rc=None, fname=None, use_defaults=True):
             panel_grid=element_blank(),
             panel_spacing=m,
             plot_caption=element_text(
+                size=base_size * 0.8,
                 ha="right",
                 va="bottom",
                 ma="left",
                 margin=margin(t=m, unit="fig"),
             ),
             plot_footer=element_text(
+                size=base_size * 0.8,
                 ha="left",
                 va="bottom",
                 ma="left",
                 margin=margin(t=1 / 3, b=1 / 3, unit="lines"),
             ),
             plot_margin=m,
+            plot_footer_background=element_blank(),
+            plot_footer_line=element_blank(),
             plot_subtitle=element_text(
-                size=base_size * 0.9,
                 va="top",
                 ma="left",
                 margin=margin(b=m, unit="fig"),
             ),
-            plot_footer_background=element_blank(),
-            plot_footer_line=element_blank(),
             plot_title=element_text(
+                size=base_size * 1.2,
                 va="top",
                 ma="left",
                 margin=margin(b=m, unit="fig"),
@@ -117,21 +125,18 @@ def __init__(self, rc=None, fname=None, use_defaults=True):
             plot_tag_position="topleft",
             strip_align=0,
             strip_background=element_rect(
-                fill="#D9D9D9", color="black", size=linewidth
+                fill="#F2F2F2", color="black", size=linewidth
             ),
             strip_text=element_text(
-                linespacing=1.5,
+                size=base_size * 0.8,
                 margin=margin_auto(half_line * 0.8),
             ),
             strip_text_y=element_text(rotation=-90),
             complete=True,
         )
 
         if use_defaults:
-            _copy = mpl.rcParams.copy()
-            if "tk.pythoninspect" in _copy:
-                del _copy["tk.pythoninspect"]
-            self._rcParams.update(_copy)
+            self._rcParams.update(mpl.rcParams.copy())
 
         if fname:
             self._rcParams.update(mpl.rc_params_from_file(fname))

diff --git a/plotnine/themes/theme_seaborn.py b/plotnine/themes/theme_seaborn.py
@@ -136,7 +136,6 @@ def __init__(
             strip_background=element_rect(color="none", fill="#D1CDDF"),
             strip_text=element_text(
                 size=base_size * 0.8,
-                linespacing=1.5,
                 margin=margin_auto(half_line * 0.8),
             ),
             strip_text_y=element_text(rotation=-90),

diff --git a/plotnine/themes/theme_void.py b/plotnine/themes/theme_void.py
@@ -36,7 +36,7 @@ def __init__(self, base_size=11, base_family=None):
                 style="normal",
                 color="black",
                 size=base_size,
-                linespacing=1.2,
+                linespacing="normal",
                 rotation=0,
                 margin=margin(),
             ),

diff --git a/plotnine/themes/themeable.py b/plotnine/themes/themeable.py
@@ -30,6 +30,7 @@
     from matplotlib.artist import Artist
     from matplotlib.axes import Axes
     from matplotlib.figure import Figure
+    from matplotlib.typing import RcKeyType
 
     from plotnine import theme
     from plotnine.themes.targets import ThemeTargets
@@ -167,7 +168,7 @@ def __eq__(self, other: object) -> bool:
         )
 
     @property
-    def rcParams(self) -> dict[str, Any]:
+    def rcParams(self) -> dict[RcKeyType, Any]:
         """
         Return themeables rcparams to an rcparam dict before plotting.
 
@@ -1065,7 +1066,7 @@ class text(axis_text, legend_text, strip_text, title):
     """
 
     @property
-    def rcParams(self) -> dict[str, Any]:
+    def rcParams(self):
         rcParams = super().rcParams
 
         family = self.properties.get("family")
@@ -1521,7 +1522,7 @@ class line(axis_line, axis_ticks, panel_grid, legend_ticks, plot_footer_line):
     """
 
     @property
-    def rcParams(self) -> dict[str, Any]:
+    def rcParams(self):
         rcParams = super().rcParams
         color = self.properties.get("color")
         linewidth = self.properties.get("linewidth")
@@ -2136,7 +2137,7 @@ class dpi(themeable):
     # https://github.com/matplotlib/matplotlib/issues/24644
 
     @property
-    def rcParams(self) -> dict[str, Any]:
+    def rcParams(self):
         rcParams = super().rcParams
         rcParams["figure.dpi"] = self.properties["value"]
         return rcParams
@@ -2542,7 +2543,7 @@ class svg_usefonts(themeable):
     """
 
     @property
-    def rcParams(self) -> dict[str, Any]:
+    def rcParams(self):
         rcParams = super().rcParams
 
         rcParams["svg.fonttype"] = (

diff --git a/pyproject.toml b/pyproject.toml
@@ -15,26 +15,26 @@ classifiers = [
     "Operating System :: Unix",
     "Operating System :: MacOS",
     "Programming Language :: Python :: 3 :: Only",
-    "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
     "Programming Language :: Python :: 3.12",
     "Programming Language :: Python :: 3.13",
+    "Programming Language :: Python :: 3.14",
     "Framework :: Matplotlib",
     "Topic :: Scientific/Engineering :: Visualization"
 ]
 dependencies = [
-    "matplotlib>=3.8.0",
+    "matplotlib>=3.11.0",
     "pandas>=2.2.0",
     "mizani~=0.14.0",
-    "numpy>=1.23.5",
-    "scipy>=1.8.0",
+    "numpy>=1.25.0",
+    "scipy>=1.15.0",
     # pyodide ships with statmodels==0.14.4 which is broken for later versions
     # of numpy and pandas
     # https://github.com/statsmodels/statsmodels/releases/tag/v0.14.6
     "statsmodels<=0.14.4; sys_platform == 'emscripten'",
     "statsmodels>=0.14.6; sys_platform != 'emscripten'",
 ]
-requires-python = ">=3.10"
+requires-python = ">=3.11"
 
 [project.optional-dependencies]
 all = [

diff --git a/tests/baseline_images/test_aes/geom_crossbar.png b/tests/baseline_images/test_aes/geom_crossbar.png
diff --git a/tests/baseline_images/test_aes/irregular_shapes.png b/tests/baseline_images/test_aes/irregular_shapes.png
diff --git a/tests/baseline_images/test_aes/reorder.png b/tests/baseline_images/test_aes/reorder.png
diff --git a/tests/baseline_images/test_aes/reorder_index.png b/tests/baseline_images/test_aes/reorder_index.png
diff --git a/tests/baseline_images/test_aes/stat_bin_2d.png b/tests/baseline_images/test_aes/stat_bin_2d.png
diff --git a/tests/baseline_images/test_aes/stat_ecdf.png b/tests/baseline_images/test_aes/stat_ecdf.png
diff --git a/tests/baseline_images/test_aes/test_stat_function.png b/tests/baseline_images/test_aes/test_stat_function.png
diff --git a/tests/baseline_images/test_annotate/annotate_faceting.png b/tests/baseline_images/test_annotate/annotate_faceting.png
diff --git a/tests/baseline_images/test_annotate/multiple_annotation_geoms.png b/tests/baseline_images/test_annotate/multiple_annotation_geoms.png
diff --git a/tests/baseline_images/test_annotation_logticks/annotation_logticks.png b/tests/baseline_images/test_annotation_logticks/annotation_logticks.png
diff --git a/tests/baseline_images/test_annotation_logticks/annotation_logticks_base_5.png b/tests/baseline_images/test_annotation_logticks/annotation_logticks_base_5.png
diff --git a/tests/baseline_images/test_annotation_logticks/annotation_logticks_base_8.png b/tests/baseline_images/test_annotation_logticks/annotation_logticks_base_8.png
diff --git a/tests/baseline_images/test_annotation_logticks/annotation_logticks_coord_flip.png b/tests/baseline_images/test_annotation_logticks/annotation_logticks_coord_flip.png
diff --git a/...ine_images/test_annotation_logticks/annotation_logticks_coord_flip_discrete.png b/...ine_images/test_annotation_logticks/annotation_logticks_coord_flip_discrete.png
diff --git a/...ges/test_annotation_logticks/annotation_logticks_coord_flip_discrete_bottom.png b/...ges/test_annotation_logticks/annotation_logticks_coord_flip_discrete_bottom.png
diff --git a/tests/baseline_images/test_annotation_logticks/annotation_logticks_faceting.png b/tests/baseline_images/test_annotation_logticks/annotation_logticks_faceting.png
diff --git a/tests/baseline_images/test_annotation_stripes/annotation_stripes.png b/tests/baseline_images/test_annotation_stripes/annotation_stripes.png
diff --git a/...baseline_images/test_annotation_stripes/annotation_stripes_continuous_scale.png b/...baseline_images/test_annotation_stripes/annotation_stripes_continuous_scale.png
diff --git a/tests/baseline_images/test_annotation_stripes/annotation_stripes_coord_flip.png b/tests/baseline_images/test_annotation_stripes/annotation_stripes_coord_flip.png
diff --git a/tests/baseline_images/test_annotation_stripes/annotation_stripes_faceting.png b/tests/baseline_images/test_annotation_stripes/annotation_stripes_faceting.png
diff --git a/...ine_images/test_annotation_stripes/annotation_stripes_fill_direction_extend.png b/...ine_images/test_annotation_stripes/annotation_stripes_fill_direction_extend.png
diff --git a/tests/baseline_images/test_annotation_stripes/annotation_stripes_fill_range.png b/tests/baseline_images/test_annotation_stripes/annotation_stripes_fill_range.png
diff --git a/...baseline_images/test_annotation_stripes/annotation_stripes_fill_range_cycle.png b/...baseline_images/test_annotation_stripes/annotation_stripes_fill_range_cycle.png
diff --git a/tests/baseline_images/test_annotation_stripes/annotation_stripes_single_stripe.png b/tests/baseline_images/test_annotation_stripes/annotation_stripes_single_stripe.png
diff --git a/tests/baseline_images/test_coords/coord_fixed.png b/tests/baseline_images/test_coords/coord_fixed.png
diff --git a/tests/baseline_images/test_coords/coord_flip.png b/tests/baseline_images/test_coords/coord_flip.png
diff --git a/tests/baseline_images/test_coords/coord_trans.png b/tests/baseline_images/test_coords/coord_trans.png
diff --git a/tests/baseline_images/test_coords/coord_trans_backtransform.png b/tests/baseline_images/test_coords/coord_trans_backtransform.png
diff --git a/tests/baseline_images/test_coords/coord_trans_reverse.png b/tests/baseline_images/test_coords/coord_trans_reverse.png
diff --git a/tests/baseline_images/test_coords/datetime_scale_limits.png b/tests/baseline_images/test_coords/datetime_scale_limits.png
diff --git a/tests/baseline_images/test_facet_labelling/aslabeller_dict_0tag.png b/tests/baseline_images/test_facet_labelling/aslabeller_dict_0tag.png
diff --git a/tests/baseline_images/test_facet_labelling/aslabeller_func_hashtagit.png b/tests/baseline_images/test_facet_labelling/aslabeller_func_hashtagit.png
diff --git a/tests/baseline_images/test_facet_labelling/label_both.png b/tests/baseline_images/test_facet_labelling/label_both.png
diff --git a/tests/baseline_images/test_facet_labelling/label_context.png b/tests/baseline_images/test_facet_labelling/label_context.png
diff --git a/tests/baseline_images/test_facet_labelling/label_context_wrap2vars.png b/tests/baseline_images/test_facet_labelling/label_context_wrap2vars.png
diff --git a/tests/baseline_images/test_facet_labelling/label_value.png b/tests/baseline_images/test_facet_labelling/label_value.png
diff --git a/tests/baseline_images/test_facet_labelling/labeller_cols_both_grid.png b/tests/baseline_images/test_facet_labelling/labeller_cols_both_grid.png
diff --git a/tests/baseline_images/test_facet_labelling/labeller_cols_both_wrap.png b/tests/baseline_images/test_facet_labelling/labeller_cols_both_wrap.png
diff --git a/tests/baseline_images/test_facet_labelling/labeller_towords.png b/tests/baseline_images/test_facet_labelling/labeller_towords.png
diff --git a/tests/baseline_images/test_facet_labelling/uneven_num_of_lines.png b/tests/baseline_images/test_facet_labelling/uneven_num_of_lines.png
diff --git a/tests/baseline_images/test_facets/array_mapping_and_evaluation.png b/tests/baseline_images/test_facets/array_mapping_and_evaluation.png
diff --git a/tests/baseline_images/test_facets/dir_v_ncol.png b/tests/baseline_images/test_facets/dir_v_ncol.png
diff --git a/tests/baseline_images/test_facets/facet_grid_drop_false.png b/tests/baseline_images/test_facets/facet_grid_drop_false.png
diff --git a/tests/baseline_images/test_facets/facet_grid_expression.png b/tests/baseline_images/test_facets/facet_grid_expression.png
diff --git a/tests/baseline_images/test_facets/facet_grid_formula_only_cols.png b/tests/baseline_images/test_facets/facet_grid_formula_only_cols.png
diff --git a/tests/baseline_images/test_facets/facet_grid_formula_only_rows.png b/tests/baseline_images/test_facets/facet_grid_formula_only_rows.png
diff --git a/tests/baseline_images/test_facets/facet_grid_margins.png b/tests/baseline_images/test_facets/facet_grid_margins.png
diff --git a/tests/baseline_images/test_facets/facet_grid_one_by_one_var.png b/tests/baseline_images/test_facets/facet_grid_one_by_one_var.png
diff --git a/tests/baseline_images/test_facets/facet_grid_scales_free_x.png b/tests/baseline_images/test_facets/facet_grid_scales_free_x.png
diff --git a/tests/baseline_images/test_facets/facet_grid_scales_free_y.png b/tests/baseline_images/test_facets/facet_grid_scales_free_y.png
diff --git a/tests/baseline_images/test_facets/facet_grid_space_free.png b/tests/baseline_images/test_facets/facet_grid_space_free.png
diff --git a/tests/baseline_images/test_facets/facet_grid_space_ratios.png b/tests/baseline_images/test_facets/facet_grid_space_ratios.png
diff --git a/tests/baseline_images/test_facets/facet_wrap_direction_v.png b/tests/baseline_images/test_facets/facet_wrap_direction_v.png
diff --git a/tests/baseline_images/test_facets/facet_wrap_expression.png b/tests/baseline_images/test_facets/facet_wrap_expression.png
diff --git a/tests/baseline_images/test_facets/facet_wrap_label_both.png b/tests/baseline_images/test_facets/facet_wrap_label_both.png
diff --git a/tests/baseline_images/test_facets/facet_wrap_not_as_table.png b/tests/baseline_images/test_facets/facet_wrap_not_as_table.png
diff --git a/tests/baseline_images/test_facets/facet_wrap_not_as_table_direction_v.png b/tests/baseline_images/test_facets/facet_wrap_not_as_table_direction_v.png
diff --git a/tests/baseline_images/test_facets/facet_wrap_one_var.png b/tests/baseline_images/test_facets/facet_wrap_one_var.png
diff --git a/tests/baseline_images/test_facets/facet_wrap_two_vars.png b/tests/baseline_images/test_facets/facet_wrap_two_vars.png
diff --git a/tests/baseline_images/test_facets/manual_mapping_with_lists.png b/tests/baseline_images/test_facets/manual_mapping_with_lists.png
diff --git a/tests/baseline_images/test_facets/non_mapped_facetting.png b/tests/baseline_images/test_facets/non_mapped_facetting.png
diff --git a/tests/baseline_images/test_facets/variable_and_annotate.png b/tests/baseline_images/test_facets/variable_and_annotate.png
diff --git a/tests/baseline_images/test_geom_abline/aes_inheritance.png b/tests/baseline_images/test_geom_abline/aes_inheritance.png
diff --git a/tests/baseline_images/test_geom_abline/aesthetics.png b/tests/baseline_images/test_geom_abline/aesthetics.png
diff --git a/tests/baseline_images/test_geom_bar_col_histogram/bar-count.png b/tests/baseline_images/test_geom_bar_col_histogram/bar-count.png
diff --git a/tests/baseline_images/test_geom_bar_col_histogram/col.png b/tests/baseline_images/test_geom_bar_col_histogram/col.png
diff --git a/tests/baseline_images/test_geom_bar_col_histogram/col_just.png b/tests/baseline_images/test_geom_bar_col_histogram/col_just.png
diff --git a/tests/baseline_images/test_geom_bar_col_histogram/histogram-count.png b/tests/baseline_images/test_geom_bar_col_histogram/histogram-count.png
diff --git a/tests/baseline_images/test_geom_bar_col_histogram/histogram_weights.png b/tests/baseline_images/test_geom_bar_col_histogram/histogram_weights.png
diff --git a/tests/baseline_images/test_geom_bar_col_histogram/stat-count-float.png b/tests/baseline_images/test_geom_bar_col_histogram/stat-count-float.png
diff --git a/tests/baseline_images/test_geom_bar_col_histogram/stat-count-int.png b/tests/baseline_images/test_geom_bar_col_histogram/stat-count-int.png
diff --git a/tests/baseline_images/test_geom_bin_2d/drop_false.png b/tests/baseline_images/test_geom_bin_2d/drop_false.png
diff --git a/tests/baseline_images/test_geom_bin_2d/drop_true.png b/tests/baseline_images/test_geom_bin_2d/drop_true.png
diff --git a/tests/baseline_images/test_geom_blank/blank.png b/tests/baseline_images/test_geom_blank/blank.png
diff --git a/tests/baseline_images/test_geom_boxplot/aesthetics+coord_flip.png b/tests/baseline_images/test_geom_boxplot/aesthetics+coord_flip.png
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