From c72a1b29330c5fc6027b5438a9e826c522c89bd0 Mon Sep 17 00:00:00 2001
From: Ran Benita <ran@unusedvar.com>
Date: Wed, 29 Apr 2020 14:33:57 +0300
Subject: [PATCH] config: replace usage of py.io.dupfile

As part of the effort to remove uses of `py`.
---
 src/_pytest/config/__init__.py | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/_pytest/config/__init__.py b/src/_pytest/config/__init__.py
index 6d18eeb65..8e5944fc7 100644
--- a/src/_pytest/config/__init__.py
+++ b/src/_pytest/config/__init__.py
@@ -308,7 +308,9 @@ class PytestPluginManager(PluginManager):
             err = sys.stderr
             encoding = getattr(err, "encoding", "utf8")
             try:
-                err = py.io.dupfile(err, encoding=encoding)
+                err = open(
+                    os.dup(err.fileno()), mode=err.mode, buffering=1, encoding=encoding,
+                )
             except Exception:
                 pass
             self.trace.root.setwriter(err.write)