Unicode output to file

[Евгений Косенко]

Hi!

The next program

f = file("content.new", "wb")
print f.encoding
f.write(u"Привет")

Gives the next results:

sys:1: DeprecationWarning: Non-ASCII character '\xcf' in file xp.py on line 
10, but no encoding declared; see http://www.python.org/peps/pep-0263.html 
for details
None
Traceback (most recent call last):
  File "xp.py", line 10, in ?
    f.write(u"Привет")
UnicodeEncodeError: 'ascii' codec can't encode characters in position 0-5: 
ordinal not in range(128)

I use here Russian letters, and need special encoding for them. The property 
'encoding' is read-only, and is None by default. How to cast the encoding for 
a file?