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No, I don't want to change this either.  choice() is one of the 
few library functions where speed matters a lot, and checking 
for invalid arguments *just* to give a wordier error message 
would be a losing tradeoff because of that.  If you want to 
add a line to the docs, that's cool, but not "If the sequence 
is empty, raises TypeError".  That's a bad idea because it 
actually raises IndexError <wink>.