From 93d45ecc540047f026f53cfbd494639851f0dc01 Mon Sep 17 00:00:00 2001
From: Eric Wieser <wieser.eric@gmail.com>
Date: Mon, 30 Mar 2020 12:16:05 +0100
Subject: [PATCH] MAINT: Replace uses of tostring with tobytes

tostring() is the pre-numpy-1.9 name, and is not a good name in python3 where the return type is _not_ `str`.
---
 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 1399e8a52fc5..32645ff92a5f 100644
--- a/lib/matplotlib/backends/backend_pdf.py
+++ b/lib/matplotlib/backends/backend_pdf.py
@@ -1406,7 +1406,7 @@ 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)
 
@@ -1497,7 +1497,7 @@ def _writeImg(self, data, 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 acf3f03747ea..d95d6ea60f2b 100644
--- a/lib/matplotlib/backends/backend_ps.py
+++ b/lib/matplotlib/backends/backend_ps.py
@@ -632,7 +632,7 @@ def draw_gouraud_triangles(self, gc, points, colors, trans):
         streamarr['flags'] = 0
         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 9d4b773e7f2a..63c02979a6e8 100644
--- a/lib/matplotlib/backends/backend_wx.py
+++ b/lib/matplotlib/backends/backend_wx.py
@@ -237,7 +237,7 @@ 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.select()
         gc.gfx_ctx.DrawBitmap(bitmap, int(l), int(self.height - b),
                               int(w), int(-h))