[xlwt] Changing Cell Background Color

[Chanman]

I've posted this on the python-excel group, but perhaps people here
know what to do.

How does one change the cell background color using the xlwt module?
I've looked at several tutorials but none show how to change the
background color.  I've tried the following:

badBG = xlwt.Pattern()
badBG.SOLID_PATTERN = 0x34
badBG.NO_PATTERN = 0x34
badBG.pattern_fore_colour = 0x34
badBG.pattern_back_colour = 0x34

badFontStyle = xlwt.XFStyle()
badFontStyle.Pattern = badBG

sheet1.write(1,1,'hello world', badFontStyle)

However, the background cell color still remains white.  Any help
appreciated.