Antoine Pitrou <pit...@free.fr> added the comment:

It is more complicated than that. The algorithm is currently as follows
(copied from TextIOWrapper.__init__):

        if encoding is None:
            try:
                encoding = os.device_encoding(buffer.fileno())
            except (AttributeError, UnsupportedOperation):
                pass
            if encoding is None:
                try:
                    import locale
                except ImportError:
                    # Importing locale may fail if Python is being built
                    encoding = "ascii"
                else:
                    encoding = locale.getpreferredencoding()

----------
nosy: +pitrou

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue5107>
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