From b8dcf992d87eb5519950048e26e8a0cbbe420640 Mon Sep 17 00:00:00 2001
From: elie <elie>
Date: Fri, 14 Mar 2014 21:12:44 +0000
Subject: handle the case of absent stderr stream at Debug printer

---
 CHANGES         | 1 +
 pyasn1/debug.py | 5 ++++-
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/CHANGES b/CHANGES
index 93959b4..3b2fd14 100644
--- a/CHANGES
+++ b/CHANGES
@@ -34,6 +34,7 @@ Revision 0.1.8
 - More Python magic methods implementations added to Integer & Real classes
   (e.g.  __pos__, __neg__, __round__, __floor__, __ceil__, __trunc__)
 - The Integer.__invert__ Python magic method implemented.
+- Handle the case of absent stderr stream at Debug printer.
 - Fix to NamedType.__repr__() to work properly.
 - Fixes to __repr__() implementation of many built-in ASN.1 types to take into
   account all of their initializers such as tagSet, subtypeSpec etc.
diff --git a/pyasn1/debug.py b/pyasn1/debug.py
index c27cb1d..04edbb6 100644
--- a/pyasn1/debug.py
+++ b/pyasn1/debug.py
@@ -18,7 +18,10 @@ class Debug:
     defaultPrinter = sys.stderr.write
     def __init__(self, *flags):
         self._flags = flagNone
-        self._printer = self.defaultPrinter
+        if self.defaultPrinter:
+            self._printer = self.defaultPrinter
+        else:
+            self._printer = lambda x: None  # stderr may not be available
         self('running pyasn1 version %s' % __version__)
         for f in flags:
             if f not in flagMap:
-- 
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