Backport PR #12037: Fix ArtistInspector.get_aliases.

jklymak · MeeseeksDev[bot] · commit 56fb1c6e2be3 · 2018-09-10T17:28:34.000Z
diff --git a/doc/users/next_whats_new/2018-09-06-AL.rst b/doc/users/next_whats_new/2018-09-06-AL.rst
@@ -0,0 +1,12 @@
+:orphan:
+
+Return type of ArtistInspector.get_aliases changed
+``````````````````````````````````````````````````
+
+`ArtistInspector.get_aliases` previously returned the set of aliases as
+``{fullname: {alias1: None, alias2: None, ...}}``.  The dict-to-None mapping
+was used to simulate a set in earlier versions of Python.  It has now been
+replaced by a set, i.e. ``{fullname: {alias1, alias2, ...}}``.
+
+This value is also stored in `ArtistInspector.aliasd`, which has likewise
+changed.
diff --git a/lib/matplotlib/artist.py b/lib/matplotlib/artist.py
@@ -1113,15 +1113,14 @@ def __init__(self, o):
 
     def get_aliases(self):
         """
-        Get a dict mapping *fullname* -> *alias* for each *alias* in
-        the :class:`~matplotlib.artist.ArtistInspector`.
+        Get a dict mapping property fullnames to sets of aliases for each alias
+        in the :class:`~matplotlib.artist.ArtistInspector`.
 
         e.g., for lines::
 
-          {'markerfacecolor': 'mfc',
-           'linewidth'      : 'lw',
+          {'markerfacecolor': {'mfc'},
+           'linewidth'      : {'lw'},
           }
-
         """
         names = [name for name in dir(self.o)
                  if name.startswith(('set_', 'get_'))
@@ -1131,9 +1130,9 @@ def get_aliases(self):
             func = getattr(self.o, name)
             if not self.is_alias(func):
                 continue
-            docstring = func.__doc__
-            fullname = docstring.replace('`', '')[10:]
-            aliases.setdefault(fullname[4:], {})[name[4:]] = None
+            propname = re.search("`({}.*)`".format(name[:4]),  # get_.*/set_.*
+                                 func.__doc__).group(1)
+            aliases.setdefault(propname, set()).add(name[4:])
         return aliases
 
     _get_valid_values_regex = re.compile(
diff --git a/lib/matplotlib/axis.py b/lib/matplotlib/axis.py
@@ -30,7 +30,7 @@
 # allows all Line2D kwargs.
 _line_AI = artist.ArtistInspector(mlines.Line2D)
 _line_param_names = _line_AI.get_setters()
-_line_param_aliases = [list(d.keys())[0] for d in _line_AI.aliasd.values()]
+_line_param_aliases = [list(d)[0] for d in _line_AI.aliasd.values()]
 _gridline_param_names = ['grid_' + name
                          for name in _line_param_names + _line_param_aliases]
 
