Merged revisions 76806,76808 via svnmerge from

Merged revisions 76806,76808 via svnmerge from
svn+ssh://pythondev@svn.python.org/python/branches/py3k

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  r76806 | benjamin.peterson | 2009-12-13 13:25:34 -0600 (Sun, 13 Dec 2009) | 14 lines

  Merged revisions 76805 via svnmerge from
  svn+ssh://pythondev@svn.python.org/python/trunk

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    r76805 | benjamin.peterson | 2009-12-13 13:19:07 -0600 (Sun, 13 Dec 2009) | 7 lines

    accept None as the same as having passed no argument in file types #7349

    This is for consistency with imitation file objects like StringIO and BytesIO.

    This commit also adds a few tests, where they were lacking for concerned
    methods.
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  r76808 | benjamin.peterson | 2009-12-13 13:28:09 -0600 (Sun, 13 Dec 2009) | 9 lines

  Merged revisions 76807 via svnmerge from
  svn+ssh://pythondev@svn.python.org/python/trunk

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    r76807 | benjamin.peterson | 2009-12-13 13:27:02 -0600 (Sun, 13 Dec 2009) | 1 line

    remove unused variable
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