From d679e09970465d1b914b7d3dc11eaddbbcd6d289 Mon Sep 17 00:00:00 2001
From: Fred Drake <fdrake@acm.org>
Date: Tue, 17 Sep 2002 18:10:34 +0000
Subject: [PATCH] write():  Special case the common situation of a stream
 that's only           being used to dump output (no seeks), so we can avoid a
 lot           of extra checks being made.

---
 Lib/StringIO.py | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/Lib/StringIO.py b/Lib/StringIO.py
index 7c4b6c7705c..79ab7e16b32 100644
--- a/Lib/StringIO.py
+++ b/Lib/StringIO.py
@@ -152,6 +152,10 @@ class StringIO:
         # Force s to be a string or unicode
         if not isinstance(s, basestring):
             s = str(s)
+        if self.pos == self.len:
+            self.buflist.append(s)
+            self.len = self.pos = self.pos + len(s)
+            return
         if self.pos > self.len:
             self.buflist.append('\0'*(self.pos - self.len))
             self.len = self.pos