The file encodings/mac_roman.py in Python 2.4.1
contains the following incorrect character definition
on line 96: 

        0x00bd: 0x2126, # OHM SIGN

This should read: 

        0x00bd: 0x03A9, # GREEK CAPITAL LETTER OMEGA

Presumably this bug occurred due to a misreading, given
that OHM and OMEGA having the same glyph. Evidence that
the OMEGA interpretation is correct: 

0xBD   0x03A9   # GREEK CAPITAL LETTER OMEGA
-http://www.unicode.org/Public/MAPPINGS/VENDORS/APPLE/ROMAN.TXT

Further evidence can be found by Googling for MacRoman
tables. This bug means that, for example, the following
code gives a UnicodeEncodeError when it shouldn't do: 

>>> u'\u03a9'.encode('macroman')

For a workaround, I've been using the following code: 

>>> import codecs
>>> from encodings import mac_roman
>>> mac_roman.decoding_map[0xBD] = 0x03A9
>>> mac_roman.encoding_map =
codecs.make_encoding_map(mac_roman.decoding_map)

And then, to use the example above: 

>>> u'\u03a9'.encode('macroman')
'\xbd'
>>> 

Thanks,

-- 
Sean B. Palmer

Logged In: YES 
user_id=38388

This has been fixed in CVS and Python 2.5 will include the fix. 

A backport is not possible, because we've changed the way
charmap codecs work in 2.5.