Ignore IOError exceptions when writing the message.
diff --git a/Lib/warnings.py b/Lib/warnings.py
index 383e623..a74e1ba 100644
--- a/Lib/warnings.py
+++ b/Lib/warnings.py
@@ -107,7 +107,10 @@
"""Hook to write a warning to a file; replace if you like."""
if file is None:
file = sys.stderr
- file.write(formatwarning(message, category, filename, lineno))
+ try:
+ file.write(formatwarning(message, category, filename, lineno))
+ except IOError:
+ pass # the file (probably stderr) is invalid - this warning gets lost.
def formatwarning(message, category, filename, lineno):
"""Function to format a warning the standard way."""