Use _val_or_rc in more places

lib/matplotlib/axes/_axes.py

@@ -168,11 +168,8 @@ def set_title(self, label, fontdict=None, loc=None, pad=None, *, y=None,
             Other keyword arguments are text properties, see `.Text` for a list
             of valid text properties.
         """
-        if loc is None:
-            loc = mpl.rcParams['axes.titlelocation']
-
-        if y is None:
-            y = mpl.rcParams['axes.titley']
+        loc = mpl._val_or_rc(loc, 'axes.titlelocation').lower()
+        y = mpl._val_or_rc(y, 'axes.titley')
         if y is None:
             y = 1.0
         else:
@@ -182,18 +179,16 @@ def set_title(self, label, fontdict=None, loc=None, pad=None, *, y=None,
         titles = {'left': self._left_title,
                   'center': self.title,
                   'right': self._right_title}
-        title = _api.check_getitem(titles, loc=loc.lower())
+        title = _api.check_getitem(titles, loc=loc)
         default = {
             'fontsize': mpl.rcParams['axes.titlesize'],
             'fontweight': mpl.rcParams['axes.titleweight'],
             'verticalalignment': 'baseline',
-            'horizontalalignment': loc.lower()}
+            'horizontalalignment': loc}
         titlecolor = mpl.rcParams['axes.titlecolor']
         if not cbook._str_lower_equal(titlecolor, 'auto'):
             default["color"] = titlecolor
-        if pad is None:
-            pad = mpl.rcParams['axes.titlepad']
-        self._set_title_offset_trans(float(pad))
+        self._set_title_offset_trans(float(mpl._val_or_rc(pad, 'axes.titlepad')))
         title.set_text(label)
         title.update(default)
         if fontdict is not None:
@@ -3160,8 +3155,7 @@ def stem(self, *args, linefmt=None, markerfmt=None, basefmt=None, bottom=0,
             markerfmt = "o"
         if markerfmt == '':
             markerfmt = ' '  # = empty line style; '' would resolve rcParams
-        markerstyle, markermarker, markercolor = \
-            _process_plot_format(markerfmt)
+        markerstyle, markermarker, markercolor = _process_plot_format(markerfmt)
         if markermarker is None:
             markermarker = 'o'
         if markerstyle is None:
@@ -3176,8 +3170,7 @@ def stem(self, *args, linefmt=None, markerfmt=None, basefmt=None, bottom=0,
         basestyle, basemarker, basecolor = _process_plot_format(basefmt)
 
         # New behaviour in 3.1 is to use a LineCollection for the stemlines
-        if linestyle is None:
-            linestyle = mpl.rcParams['lines.linestyle']
+        linestyle = mpl._val_or_rc(linestyle, 'lines.linestyle')
         xlines = self.vlines if orientation == "vertical" else self.hlines
         stemlines = xlines(
             locs, bottom, heads,
@@ -3745,8 +3738,7 @@ def _upcast_err(err):
 
         # Make the style dict for caps (the "hats").
         eb_cap_style = {**base_style, 'linestyle': 'none'}
-        if capsize is None:
-            capsize = mpl.rcParams["errorbar.capsize"]
+        capsize = mpl._val_or_rc(capsize, "errorbar.capsize")
         if capsize > 0:
             eb_cap_style['markersize'] = 2. * capsize
         if capthick is not None:
@@ -4100,27 +4092,18 @@ def boxplot(self, x, notch=None, sym=None, vert=None,
         """
 
         # Missing arguments default to rcParams.
-        if whis is None:
-            whis = mpl.rcParams['boxplot.whiskers']
-        if bootstrap is None:
-            bootstrap = mpl.rcParams['boxplot.bootstrap']
+        whis = mpl._val_or_rc(whis, 'boxplot.whiskers')
+        bootstrap = mpl._val_or_rc(bootstrap, 'boxplot.bootstrap')
 
         bxpstats = cbook.boxplot_stats(x, whis=whis, bootstrap=bootstrap,
                                        labels=tick_labels, autorange=autorange)
-        if notch is None:
-            notch = mpl.rcParams['boxplot.notch']
-        if patch_artist is None:
-            patch_artist = mpl.rcParams['boxplot.patchartist']
-        if meanline is None:
-            meanline = mpl.rcParams['boxplot.meanline']
-        if showmeans is None:
-            showmeans = mpl.rcParams['boxplot.showmeans']
-        if showcaps is None:
-            showcaps = mpl.rcParams['boxplot.showcaps']
-        if showbox is None:
-            showbox = mpl.rcParams['boxplot.showbox']
-        if showfliers is None:
-            showfliers = mpl.rcParams['boxplot.showfliers']
+        notch = mpl._val_or_rc(notch, 'boxplot.notch')
+        patch_artist = mpl._val_or_rc(patch_artist, 'boxplot.patchartist')
+        meanline = mpl._val_or_rc(meanline, 'boxplot.meanline')
+        showmeans = mpl._val_or_rc(showmeans, 'boxplot.showmeans')
+        showcaps = mpl._val_or_rc(showcaps, 'boxplot.showcaps')
+        showbox = mpl._val_or_rc(showbox, 'boxplot.showbox')
+        showfliers = mpl._val_or_rc(showfliers, 'boxplot.showfliers')
 
         if boxprops is None:
             boxprops = {}
@@ -4931,8 +4914,7 @@ def scatter(self, x, y, s=None, c=None, marker=None, cmap=None, norm=None,
         scales = s   # Renamed for readability below.
 
         # load default marker from rcParams
-        if marker is None:
-            marker = mpl.rcParams['scatter.marker']
+        marker = mpl._val_or_rc(marker, 'scatter.marker')
 
         if isinstance(marker, mmarkers.MarkerStyle):
             marker_obj = marker
@@ -6478,9 +6460,7 @@ def pcolormesh(self, *args, alpha=None, norm=None, cmap=None, vmin=None,
         `~.Axes.pcolormesh`, which is not available with `~.Axes.pcolor`.
 
         """
-        if shading is None:
-            shading = mpl.rcParams['pcolor.shading']
-        shading = shading.lower()
+        shading = mpl._val_or_rc(shading, 'pcolor.shading').lower()
         kwargs.setdefault('edgecolors', 'none')
 
         X, Y, C, shading = self._pcolorargs('pcolormesh', *args,
@@ -6985,8 +6965,7 @@ def hist(self, x, bins=None, range=None, density=False, weights=None,
         if np.isscalar(x):
             x = [x]
 
-        if bins is None:
-            bins = mpl.rcParams['hist.bins']
+        bins = mpl._val_or_rc(bins, 'hist.bins')
 
         # Validate string inputs here to avoid cluttering subsequent code.
         _api.check_in_list(['bar', 'barstacked', 'step', 'stepfilled'],

lib/matplotlib/axes/_base.py

@@ -220,10 +220,8 @@ def __init__(self, output='Line2D'):
         self.set_prop_cycle(None)
 
     def set_prop_cycle(self, cycler):
-        if cycler is None:
-            cycler = mpl.rcParams['axes.prop_cycle']
         self._idx = 0
-        self._cycler_items = [*cycler]
+        self._cycler_items = [*mpl._val_or_rc(cycler, 'axes.prop_cycle')]
 
     def __call__(self, axes, *args, data=None, return_kwargs=False, **kwargs):
         axes._process_unit_info(kwargs=kwargs)
@@ -687,8 +685,7 @@ def __init__(self, fig,
 
         # this call may differ for non-sep axes, e.g., polar
         self._init_axis()
-        if facecolor is None:
-            facecolor = mpl.rcParams['axes.facecolor']
+        facecolor = mpl._val_or_rc(facecolor, 'axes.facecolor')
         self._facecolor = facecolor
         self._frameon = frameon
         self.set_axisbelow(mpl.rcParams['axes.axisbelow'])
@@ -3587,8 +3584,7 @@ def set_xlabel(self, xlabel, fontdict=None, labelpad=None, *,
                                 f"supplied")
 
         else:
-            loc = (loc if loc is not None
-                   else mpl.rcParams['xaxis.labellocation'])
+            loc = mpl._val_or_rc(loc, 'xaxis.labellocation')
             _api.check_in_list(('left', 'center', 'right'), loc=loc)
 
             x = {
@@ -3856,8 +3852,7 @@ def set_ylabel(self, ylabel, fontdict=None, labelpad=None, *,
                                 f"supplied")
 
         else:
-            loc = (loc if loc is not None
-                   else mpl.rcParams['yaxis.labellocation'])
+            loc = mpl._val_or_rc(loc, 'yaxis.labellocation')
             _api.check_in_list(('bottom', 'center', 'top'), loc=loc)
 
             y, ha = {

lib/matplotlib/axis.py

@@ -89,9 +89,9 @@ def __init__(
 
         if gridOn is None:
             which = mpl.rcParams['axes.grid.which']
-            if major and (which in ('both', 'major')):
+            if major and which in ('both', 'major'):
                 gridOn = mpl.rcParams['axes.grid']
-            elif (not major) and (which in ('both', 'minor')):
+            elif not major and which in ('both', 'minor'):
                 gridOn = mpl.rcParams['axes.grid']
             else:
                 gridOn = False
@@ -104,31 +104,15 @@ def __init__(
 
         name = self.__name__
         major_minor = "major" if major else "minor"
-
-        if size is None:
-            size = mpl.rcParams[f"{name}.{major_minor}.size"]
-        self._size = size
-
-        if width is None:
-            width = mpl.rcParams[f"{name}.{major_minor}.width"]
-        self._width = width
-
-        if color is None:
-            color = mpl.rcParams[f"{name}.color"]
-
-        if pad is None:
-            pad = mpl.rcParams[f"{name}.{major_minor}.pad"]
-        self._base_pad = pad
-
-        if labelcolor is None:
-            labelcolor = mpl.rcParams[f"{name}.labelcolor"]
-
+        self._size = mpl._val_or_rc(size, f"{name}.{major_minor}.size")
+        self._width = mpl._val_or_rc(width, f"{name}.{major_minor}.width")
+        self._base_pad = mpl._val_or_rc(pad, f"{name}.{major_minor}.pad")
+        color = mpl._val_or_rc(color, f"{name}.color")
+        labelcolor = mpl._val_or_rc(labelcolor, f"{name}.labelcolor")
         if cbook._str_equal(labelcolor, 'inherit'):
             # inherit from tick color
             labelcolor = mpl.rcParams[f"{name}.color"]
-
-        if labelsize is None:
-            labelsize = mpl.rcParams[f"{name}.labelsize"]
+        labelsize = mpl._val_or_rc(labelsize, f"{name}.labelsize")
 
         self._set_labelrotation(labelrotation)
 
@@ -154,12 +138,12 @@ def __init__(
         self.tick1line = mlines.Line2D(
             [], [],
             color=color, linestyle="none", zorder=zorder, visible=tick1On,
-            markeredgecolor=color, markersize=size, markeredgewidth=width,
+            markeredgecolor=color, markersize=self._size, markeredgewidth=self._width,
         )
         self.tick2line = mlines.Line2D(
             [], [],
             color=color, linestyle="none", zorder=zorder, visible=tick2On,
-            markeredgecolor=color, markersize=size, markeredgewidth=width,
+            markeredgecolor=color, markersize=self._size, markeredgewidth=self._width,
         )
         self.gridline = mlines.Line2D(
             [], [],
@@ -208,10 +192,8 @@ def _apply_tickdir(self, tickdir):
         # the tick{1,2}line markers.  From the user perspective this should always be
         # called through _apply_params, which further updates ticklabel positions using
         # the new pads.
-        if tickdir is None:
-            tickdir = mpl.rcParams[f'{self.__name__}.direction']
-        else:
-            _api.check_in_list(['in', 'out', 'inout'], tickdir=tickdir)
+        tickdir = mpl._val_or_rc(tickdir, f'{self.__name__}.direction')
+        _api.check_in_list(['in', 'out', 'inout'], tickdir=tickdir)
         self._tickdir = tickdir
 
     def get_tickdir(self):

lib/matplotlib/backend_bases.py

@@ -2115,8 +2115,7 @@ def print_figure(
                     filename = filename.rstrip('.') + '.' + format
         format = format.lower()
 
-        if dpi is None:
-            dpi = rcParams['savefig.dpi']
+        dpi = mpl._val_or_rc(dpi, 'savefig.dpi')
         if dpi == 'figure':
             dpi = getattr(self.figure, '_original_dpi', self.figure.dpi)
 
@@ -2129,15 +2128,12 @@ def print_figure(
               cbook._setattr_cm(self.figure.canvas, _is_saving=True),
               ExitStack() as stack):
 
-            for prop in ["facecolor", "edgecolor"]:
-                color = locals()[prop]
-                if color is None:
-                    color = rcParams[f"savefig.{prop}"]
+            for prop, color in [("facecolor", facecolor), ("edgecolor", edgecolor)]:
+                color = mpl._val_or_rc(color, f"savefig.{prop}")
                 if not cbook._str_equal(color, "auto"):
                     stack.enter_context(self.figure._cm_set(**{prop: color}))
 
-            if bbox_inches is None:
-                bbox_inches = rcParams['savefig.bbox']
+            bbox_inches = mpl._val_or_rc(bbox_inches, 'savefig.bbox')
 
             layout_engine = self.figure.get_layout_engine()
             if layout_engine is not None or bbox_inches == "tight":

lib/matplotlib/cm.py

@@ -270,8 +270,7 @@ def get_cmap(name=None, lut=None):
     -------
     Colormap
     """
-    if name is None:
-        name = mpl.rcParams['image.cmap']
+    name = mpl._val_or_rc(name, 'image.cmap')
     if isinstance(name, colors.Colormap):
         return name
     _api.check_in_list(sorted(_colormaps), name=name)
@@ -302,7 +301,7 @@ def _ensure_cmap(cmap):
     """
     if isinstance(cmap, colors.Colormap):
         return cmap
-    cmap_name = cmap if cmap is not None else mpl.rcParams["image.cmap"]
+    cmap_name = mpl._val_or_rc(cmap, "image.cmap")
     # use check_in_list to ensure type stability of the exception raised by
     # the internal usage of this (ValueError vs KeyError)
     if cmap_name not in _colormaps:

lib/matplotlib/contour.py

@@ -702,12 +702,8 @@ def __init__(self, ax, *args,
             self.origin = mpl.rcParams['image.origin']
 
         self._orig_linestyles = linestyles  # Only kept for user access.
-        self.negative_linestyles = negative_linestyles
-        # If negative_linestyles was not defined as a keyword argument, define
-        # negative_linestyles with rcParams
-        if self.negative_linestyles is None:
-            self.negative_linestyles = \
-                mpl.rcParams['contour.negative_linestyle']
+        self.negative_linestyles = mpl._val_or_rc(negative_linestyles,
+                                                  'contour.negative_linestyle')
 
         kwargs = self._process_args(*args, **kwargs)
         self._process_levels()
@@ -1314,8 +1310,7 @@ def _process_args(self, *args, corner_mask=None, algorithm=None, **kwargs):
         else:
             import contourpy
 
-            if algorithm is None:
-                algorithm = mpl.rcParams['contour.algorithm']
+            algorithm = mpl._val_or_rc(algorithm, 'contour.algorithm')
             mpl.rcParams.validate["contour.algorithm"](algorithm)
             self._algorithm = algorithm
 

lib/matplotlib/figure.py

@@ -2270,10 +2270,8 @@ def __init__(self, parent, subplotspec, *,
         super().__init__(**kwargs)
         if facecolor is None:
             facecolor = "none"
-        if edgecolor is None:
-            edgecolor = mpl.rcParams['figure.edgecolor']
-        if frameon is None:
-            frameon = mpl.rcParams['figure.frameon']
+        edgecolor = mpl._val_or_rc(edgecolor, 'figure.edgecolor')
+        frameon = mpl._val_or_rc(frameon, 'figure.frameon')
 
         self._subplotspec = subplotspec
         self._parent = parent
@@ -2609,16 +2607,11 @@ def __init__(self,
         self._button_pick_id = connect('button_press_event', self.pick)
         self._scroll_pick_id = connect('scroll_event', self.pick)
 
-        if figsize is None:
-            figsize = mpl.rcParams['figure.figsize']
-        if dpi is None:
-            dpi = mpl.rcParams['figure.dpi']
-        if facecolor is None:
-            facecolor = mpl.rcParams['figure.facecolor']
-        if edgecolor is None:
-            edgecolor = mpl.rcParams['figure.edgecolor']
-        if frameon is None:
-            frameon = mpl.rcParams['figure.frameon']
+        figsize = mpl._val_or_rc(figsize, 'figure.figsize')
+        dpi = mpl._val_or_rc(dpi, 'figure.dpi')
+        facecolor = mpl._val_or_rc(facecolor, 'figure.facecolor')
+        edgecolor = mpl._val_or_rc(edgecolor, 'figure.edgecolor')
+        frameon = mpl._val_or_rc(frameon, 'figure.frameon')
 
         if not np.isfinite(figsize).all() or (np.array(figsize) < 0).any():
             raise ValueError('figure size must be positive finite not '
@@ -2891,8 +2884,7 @@ def set_tight_layout(self, tight):
             If a dict, pass it as kwargs to `.Figure.tight_layout`, overriding the
             default paddings.
         """
-        if tight is None:
-            tight = mpl.rcParams['figure.autolayout']
+        tight = mpl._val_or_rc(tight, 'figure.autolayout')
         _tight = 'tight' if bool(tight) else 'none'
         _tight_parameters = tight if isinstance(tight, dict) else {}
         self.set_layout_engine(_tight, **_tight_parameters)
@@ -2923,8 +2915,7 @@ def set_constrained_layout(self, constrained):
         ----------
         constrained : bool or dict or None
         """
-        if constrained is None:
-            constrained = mpl.rcParams['figure.constrained_layout.use']
+        constrained = mpl._val_or_rc(constrained, 'figure.constrained_layout.use')
         _constrained = 'constrained' if bool(constrained) else 'none'
         _parameters = constrained if isinstance(constrained, dict) else {}
         self.set_layout_engine(_constrained, **_parameters)
@@ -3451,8 +3442,7 @@ def savefig(self, fname, *, transparent=None, **kwargs):
         """
 
         kwargs.setdefault('dpi', mpl.rcParams['savefig.dpi'])
-        if transparent is None:
-            transparent = mpl.rcParams['savefig.transparent']
+        transparent = mpl._val_or_rc(transparent, 'savefig.transparent')
 
         with ExitStack() as stack:
             if transparent: