1st debugging example (1)

Check that the extension module was compiled with debug mode on (usually the -g option to the C compiler)
Run python under a debugger: 
unix> gdb `which python`
GNU gdb 6.0-debian
...
(gdb) run ../../../Grid2Deff.py verify1
Starting program: /usr/bin/python ../../../Grid2Deff.py verify1
...
Program received signal SIGSEGV, Segmentation fault.
0x40cdfab3 in gridloop1 (self=0x0, args=0x1) at gridloop1.c:20
20        if (!PyArg_ParseTuple(args, "O!O!O!O:gridloop1",
This is the line where something goes wrong...

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