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Here is a new version of the class, which removes the 'newline' argument
from the constructor.
I also removed the 'encoding' argument, since this is really an
implementation detail of the underlying buffer.
Index: Lib/io.py
===================================================================
--- Lib/io.py	(revision 57564)
+++ Lib/io.py	(working copy)
@@ -1390,10 +1390,10 @@
 # XXX This is really slow, but fully functional
- def __init__(self, initial_value="", encoding="utf-8", newline=None):
+ def __init__(self, initial_value=""):
 super(StringIO, self).__init__(BytesIO(),
- encoding=encoding,
- newline=newline)
+ encoding="utf-8",
+ newline='\n')
 if initial_value:
 if not isinstance(initial_value, basestring):
 initial_value = str(initial_value)