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that didn't work for me.  Even though the latest version
2006g of pytz installed properly and "import pytz;
pytz.VERSION" returned "2006g", when I ran the roundup
install it failed. 

What I discovered is that matplotlib installs an older
version of pytz and matplotlib was ahead of pytz in
easy_install.pth.  Just a head's up in case you get more
bugs along this line.