Include length in ArtistList repr.

anntzer · anntzer · commit b71dedcf225c · 2021-04-07T11:34:06.000+02:00
Previously, printing e.g. `ax.lines` would show a bunch of `&lt;Line2D
object at 0x...&gt;`.  Now it's all hidden between an `&lt;ArtistList&gt;`,
which is useful in itself; but displaying the length of the list
(which is the main thing that could be seen from the `[&lt;Line2D object at
0x...&gt;` representation) is useful at least for debugging purposes.
diff --git a/lib/matplotlib/axes/_base.py b/lib/matplotlib/axes/_base.py
@@ -1347,7 +1347,7 @@ def __init__(self, axes, prop_name, add_name,
             )
 
         def __repr__(self):
-            return f'<Axes.ArtistList of {self._prop_name}>'
+            return f'<Axes.ArtistList of {len(self)} {self._prop_name}>'
 
         def __len__(self):
             return sum(self._type_check(artist)

Original file line number	Diff line number	Diff line change
`@@ -1347,7 +1347,7 @@ def __init__(self, axes, prop_name, add_name,`
`1347`	`1347`	`)`
`1348`	`1348`
`1349`	`1349`	`def __repr__(self):`
`1350`		`- return f'<Axes.ArtistList of {self._prop_name}>'`
	`1350`	`+ return f'<Axes.ArtistList of {len(self)} {self._prop_name}>'`
`1351`	`1351`
`1352`	`1352`	`def __len__(self):`
`1353`	`1353`	`return sum(self._type_check(artist)`