improve matplotlib import time by caching ArtistInspector

Author: eendebakpt

lib/matplotlib/artist.py

@@ -1,6 +1,6 @@
 from collections import namedtuple
 import contextlib
-from functools import wraps
+from functools import lru_cache, wraps
 import inspect
 from inspect import Signature, Parameter
 import logging
@@ -1494,17 +1494,29 @@ def get_setters(self):
                 continue
             func = getattr(self.o, name)
             if (not callable(func)
-                    or len(inspect.signature(func).parameters) < 2
+                    or self.number_of_parameters(func) < 2
                     or self.is_alias(func)):
                 continue
             setters.append(name[4:])
         return setters
 
-    def is_alias(self, o):
-        """Return whether method object *o* is an alias for another method."""
-        ds = inspect.getdoc(o)
+    @staticmethod
+    @lru_cache(maxsize=None)
+    def number_of_parameters(func):
+        """Return number of parameters of the callable *func*."""
+        return len(inspect.signature(func).parameters)
+
+    @staticmethod
+    @lru_cache(maxsize=None)
+    def is_alias(method):
+        """
+        Return whether the object *method* is an alias for another method.
+        """
+
+        ds = inspect.getdoc(method)
         if ds is None:
             return False
+
         return ds.startswith('Alias for ')
 
     def aliased_name(self, s):

lib/matplotlib/axis.py

@@ -895,8 +895,11 @@ def clear(self):
 
         This does not reset tick and tick label visibility.
         """
+        self.label._reset_visual_defaults()
+        self.offsetText._reset_visual_defaults()
+        self.labelpad = mpl.rcParams['axes.labelpad']
 
-        self.label.set_text('')  # self.set_label_text would change isDefault_
+        self._init()
 
         self._set_scale('linear')
 
@@ -2193,6 +2196,13 @@ class XAxis(Axis):
 
     def __init__(self, *args, **kwargs):
         super().__init__(*args, **kwargs)
+        self._init()
+
+    def _init(self):
+        """
+        Initialize the label and offsetText instance values and
+        `label_position` / `offset_text_position`.
+        """
         # x in axes coords, y in display coords (to be updated at draw time by
         # _update_label_positions and _update_offset_text_position).
         self.label.set(
@@ -2202,6 +2212,7 @@ def __init__(self, *args, **kwargs):
                 self.axes.transAxes, mtransforms.IdentityTransform()),
         )
         self.label_position = 'bottom'
+
         self.offsetText.set(
             x=1, y=0,
             verticalalignment='top', horizontalalignment='right',
@@ -2444,6 +2455,13 @@ class YAxis(Axis):
 
     def __init__(self, *args, **kwargs):
         super().__init__(*args, **kwargs)
+        self._init()
+
+    def _init(self):
+        """
+        Initialize the label and offsetText instance values and
+        `label_position` / `offset_text_position`.
+        """
         # x in display coords, y in axes coords (to be updated at draw time by
         # _update_label_positions and _update_offset_text_position).
         self.label.set(

lib/matplotlib/text.py

@@ -164,6 +164,39 @@ def __init__(self,
         super().__init__()
         self._x, self._y = x, y
         self._text = ''
+        self._reset_visual_defaults(
+            text=text,
+            color=color,
+            fontproperties=fontproperties,
+            usetex=usetex,
+            parse_math=parse_math,
+            wrap=wrap,
+            verticalalignment=verticalalignment,
+            horizontalalignment=horizontalalignment,
+            multialignment=multialignment,
+            rotation=rotation,
+            transform_rotates_text=transform_rotates_text,
+            linespacing=linespacing,
+            rotation_mode=rotation_mode,
+        )
+        self.update(kwargs)
+
+    def _reset_visual_defaults(
+        self,
+        text='',
+        color=None,
+        fontproperties=None,
+        usetex=None,
+        parse_math=None,
+        wrap=False,
+        verticalalignment='baseline',
+        horizontalalignment='left',
+        multialignment=None,
+        rotation=None,
+        transform_rotates_text=False,
+        linespacing=None,
+        rotation_mode=None,
+    ):
         self.set_text(text)
         self.set_color(
             color if color is not None else mpl.rcParams["text.color"])
@@ -183,7 +216,6 @@ def __init__(self,
             linespacing = 1.2  # Maybe use rcParam later.
         self.set_linespacing(linespacing)
         self.set_rotation_mode(rotation_mode)
-        self.update(kwargs)
 
     def update(self, kwargs):
         # docstring inherited