From 3ab4f651b906e47650c6b6de94ae23da08db4f58 Mon Sep 17 00:00:00 2001
From: Christian Heimes <christian@cheimes.de>
Date: Fri, 9 Nov 2007 01:27:29 +0000
Subject: seek() has to accept any int-like number

---
 Lib/io.py | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/Lib/io.py b/Lib/io.py
index d9550ae..74076d3 100644
--- a/Lib/io.py
+++ b/Lib/io.py
@@ -694,8 +694,10 @@ class BytesIO(BufferedIOBase):
         return n
 
     def seek(self, pos, whence=0):
-        if not isinstance(pos, int):
-            raise TypeError("an integer is required")
+        try:
+            pos = pos.__index__()
+        except AttributeError as err:
+            raise TypeError("an integer is required") from err
         if whence == 0:
             self._pos = max(0, pos)
         elif whence == 1:
-- 
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