From d834d1c9e62cb20c937b8e42a301d2a63a5d9622 Mon Sep 17 00:00:00 2001
From: Tim Hoffmann <2836374+timhoffm@users.noreply.github.com>
Date: Sat, 18 Apr 2020 14:36:50 +0200
Subject: [PATCH] Backport PR16958: MAINT: Replace uses of tostring with
 tobytes

---
 lib/matplotlib/backends/backend_pdf.py | 4 ++--
 lib/matplotlib/backends/backend_ps.py  | 2 +-
 lib/matplotlib/backends/backend_wx.py  | 2 +-
 3 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/lib/matplotlib/backends/backend_pdf.py b/lib/matplotlib/backends/backend_pdf.py
index d3e08d1bcf6d..d1f38990cd10 100644
--- a/lib/matplotlib/backends/backend_pdf.py
+++ b/lib/matplotlib/backends/backend_pdf.py
@@ -1394,7 +1394,7 @@ def writeGouraudTriangles(self):
             streamarr['points'] = (flat_points - points_min) * factor
             streamarr['colors'] = flat_colors[:, :colordim] * 255.0
 
-            self.write(streamarr.tostring())
+            self.write(streamarr.tobytes())
             self.endStream()
         self.writeObject(self.gouraudObject, gouraudDict)
 
@@ -1487,7 +1487,7 @@ def _writeImg(self, data, height, width, grayscale, id, smask=None):
         if png:
             self._writePng(data)
         else:
-            self.currentstream.write(data.tostring())
+            self.currentstream.write(data.tobytes())
         self.endStream()
 
     def writeImages(self):
diff --git a/lib/matplotlib/backends/backend_ps.py b/lib/matplotlib/backends/backend_ps.py
index bcc015be516d..d3850cc7cb95 100644
--- a/lib/matplotlib/backends/backend_ps.py
+++ b/lib/matplotlib/backends/backend_ps.py
@@ -694,7 +694,7 @@ def draw_gouraud_triangles(self, gc, points, colors, trans):
         streamarr['points'] = (flat_points - points_min) * factor
         streamarr['colors'] = flat_colors[:, :3] * 255.0
 
-        stream = quote_ps_string(streamarr.tostring())
+        stream = quote_ps_string(streamarr.tobytes())
 
         self._pswriter.write(f"""\
 gsave
diff --git a/lib/matplotlib/backends/backend_wx.py b/lib/matplotlib/backends/backend_wx.py
index ac61e1ca31c5..1c7e0c7df7e6 100644
--- a/lib/matplotlib/backends/backend_wx.py
+++ b/lib/matplotlib/backends/backend_wx.py
@@ -288,7 +288,7 @@ def draw_image(self, gc, x, y, im):
             w = self.width
             h = self.height
         rows, cols = im.shape[:2]
-        bitmap = wx.Bitmap.FromBufferRGBA(cols, rows, im.tostring())
+        bitmap = wx.Bitmap.FromBufferRGBA(cols, rows, im.tobytes())
         gc = self.get_gc()
         gc.select()
         gc.gfx_ctx.DrawBitmap(bitmap, int(l), int(self.height - b),