[issue12434] Strengthen 2.7 io types warning

[Roundup Robot]

Roundup Robot <devnull at psf.upfronthosting.co.za> added the comment:

New changeset 0752215f9f91 by Eli Bendersky in branch '2.7':
Issue #12434: make StringIO.write error message consistent with Python 2.7 nomenclature
http://hg.python.org/cpython/rev/0752215f9f91

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nosy: +python-dev

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