Usage:

ddmin.py script minimizes testcases that generates the same exceptions or errors as the origninal 
testcase does
It can be used to identify minimal testcases for fundamental data structure such as array as well as
python program that throws specific errors or exceptions
The exceptions that can be handled are detailedly specified in the report
run `python ddmin.py [filename]` to minimize testcases with one function stack
run `python ddmin.py -r [filename]` to minimize testcases with module import (currently only support local modules)