[Discuss-gnuradio] gr_modtool makexml fails for block coded in python

[Activecat]

Dear Sir,

In shorts, I've performed the following steps:

Step (1).  gr_modtool add -t sync -l python square3_ff

Step (2).  Edit the file "square3_ff.py" as accordingly.

Step (3).  gr_modtool makexml square3_ff

The step (3) above fails with following message:
  Searching for matching files in lib/:  
  None found.

Question: 
  Does "gr_modtool makexml" work with block coded in python ?

Regards,
activecat