This struck me also when I first saw this post. It reminded me of a body of code I inherited at a former job, that I had to help untangle. The code was filled with two key variables: t_1 and t_l. Printing out the source in a Courier font made these two vars completely indistinguishable, and it took a while to realize that there even were two different vars. After globally replacing them with t_first and t_last, things became a lot clearer!
-- Paul -- http://mail.python.org/mailman/listinfo/python-list
