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https://github.com/texworld/tikzplotlib/issues/567
https://github.com/texworld/tikzplotlib/pull/558

From f9988eb6aa7cc7d55c0bb528c53e7a8408308939 Mon Sep 17 00:00:00 2001
From: Paul Kim <44695374+thekpaul@users.noreply.github.com>
Date: Mon, 3 Oct 2022 01:15:21 +0900
Subject: [PATCH 1/2] Legend Compatibility Issue in texworld#557

.

.
--- a/src/tikzplotlib/_legend.py
+++ b/src/tikzplotlib/_legend.py
@@ -78,7 +78,7 @@ def draw_legend(data, obj):
     if alignment:
         data["current axes"].axis_options.append(f"legend cell align={{{alignment}}}")
 
-    if obj._ncol != 1:
+    if obj._ncols != 1:
         data["current axes"].axis_options.append(f"legend columns={obj._ncol}")
 
     # Write styles to data

From 61f7ea2fb2633f1c0de48f8da1f90a5f9ba078c1 Mon Sep 17 00:00:00 2001
From: Paul Kim <44695374+thekpaul@users.noreply.github.com>
Date: Wed, 5 Oct 2022 11:30:48 +0900
Subject: [PATCH 2/2] Backwards Compat for `ncol`

Co-authored-by: st-- <st--@users.noreply.github.com>
--- a/src/tikzplotlib/_legend.py
+++ b/src/tikzplotlib/_legend.py
@@ -78,8 +78,13 @@ def draw_legend(data, obj):
     if alignment:
         data["current axes"].axis_options.append(f"legend cell align={{{alignment}}}")
 
-    if obj._ncols != 1:
-        data["current axes"].axis_options.append(f"legend columns={obj._ncol}")
+    try:
+        ncols = obj._ncols
+    except AttributeError:
+        # backwards-compatibility with matplotlib < 3.6.0
+        ncols = obj._ncol
+    if ncols != 1:
+        data["current axes"].axis_options.append(f"legend columns={ncols}")
 
     # Write styles to data
     if legend_style: