codec for UTF-8 with BOM

[Ulrich Eckhardt]

Hi!

I want to write a file starting with the BOM and using UTF-8, and stumbled 
across some problems:

1. I would have expected one of the codecs to be 'UTF-8 with BOM' or 
something like that, but I can't find the correct name. Also, I can't find a 
way to get a list of the supported codecs at all, which strikes me as odd.


2. I couldn't find a way to write the BOM either. Writing codecs.BOM doesn't 
work, as it is an already encoded byte string. Of course, I can write 
u'\ufeff', but I'd rather avoid such magic numbers in my code.


3. The docs mention encodings.utf_8_sig, available since 2.5, but I can't 
locate that thing there either. What's going on here?


What would you do?

Uli

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