From dcce8391d1c76ebc6f81a0d22224e29f0a9f0c49 Mon Sep 17 00:00:00 2001
From: Guido van Rossum <guido@python.org>
Date: Wed, 29 Aug 2007 18:10:08 +0000
Subject: Insist that the argument to TextIOWrapper.write() is a basestring
 instance.  This was effectively already the case, but the error reporting was
 lousy.

---
 Lib/io.py | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Lib/io.py b/Lib/io.py
index 7aa79ce..375ae6e 100644
--- a/Lib/io.py
+++ b/Lib/io.py
@@ -1093,6 +1093,9 @@ class TextIOWrapper(TextIOBase):
     def write(self, s: str):
         if self.closed:
             raise ValueError("write to closed file")
+        if not isinstance(s, basestring):
+            raise TypeError("can't write %s to text stream" %
+                            s.__class__.__name__)
         haslf = "\n" in s
         if haslf and self._writetranslate and self._writenl != "\n":
             s = s.replace("\n", self._writenl)
-- 
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