[Discuss-gnuradio] USRP error

[teka yemane]

I have installed gnuradio but when I run a python code, I receive the following error:

address@hidden python]# ./usrp_fsk4.py -F test.dat -p 1 >demod_text.txt
Traceback (most recent call last):
  File "./usrp_fsk4.py", line 32, in <module>
    from gnuradio import gr, gru, usrp, optfir, eng_notation, blks
ImportError: cannot import name usrp

pls some body help me why this error is coming? Should I install USRP
alone again and if so at whcih path?
Thanks,
Teka