From b71dedcf225cc3ac475f39314cc0715b4b9a4940 Mon Sep 17 00:00:00 2001
From: Antony Lee <anntzer.lee@gmail.com>
Date: Wed, 7 Apr 2021 11:34:06 +0200
Subject: [PATCH] Include length in ArtistList repr.

Previously, printing e.g. `ax.lines` would show a bunch of `<Line2D
object at 0x...>`.  Now it's all hidden between an `<ArtistList>`,
which is useful in itself; but displaying the length of the list
(which is the main thing that could be seen from the `[<Line2D object at
0x...>` representation) is useful at least for debugging purposes.
---
 lib/matplotlib/axes/_base.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/matplotlib/axes/_base.py b/lib/matplotlib/axes/_base.py
index 3b531f868254..8397d7d334f3 100644
--- 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)