I know in the field calculator you can do fairly complex updates or create a new field from expressions.  What I'd like to do would be to run a python function on a field.  Actually this time around I need to map one field value with a lookup table into another value in a new field.  I know I could go through each unique value and map it by hand with the field calculator but there are thousands of values.  I'll probably just write a script to update the dbf file but it seems like this would be a useful feature.
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