error when i use cvblob python swig interface in ubuntu opencv test.py about cvblob HOT 2 OPEN

The Python/swig branch currently only supports OpenCV-2.1.0.

All bets are off for more recent versions of OpenCV.

To solve this error that you are getting you need to edit the 
cvblob_pytypemaps.i file found at CVBLOB_ROOT_DIR/interfaces/swig/python and 
change the is_iplimage function to be 

return (strcmp(o->ob_type->tp_name,"cv2.cv.iplimage") == 0);

Note the difference in the compare string it now has a prefix of cv2.

This will make the python bindings works with opencv 2.3.1a

Then to apply the fix run

make clean
make
sudo make install

The test.py program will then run successfully.