[issue5006] Duplicate UTF-16 BOM if a file is open in append mode

[STINNER Victor]

STINNER Victor <victor.stinner at haypocalc.com> added the comment:

Bug is reproductible with:
 * Python 2.5 : charset utf-8-sig and utf-16 for codecs.open()
 * trunk : charset utf-8-sig, utf-16 and utf-32 for codecs.open()
 * py3k : charset utf-8-sig, utf-16 and utf-32 for open()

With utf-7 or utf-8, no BOM is written.

Note: with UTF-32, the BOM is 4 bytes long (0xff 0xfe 0x00 0x00 on 
little endian) but it's still the character (BOM) \ufeff (little 
endian).

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versions: +Python 2.6, Python 2.7

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<http://bugs.python.org/issue5006>
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