# ImportError: cannot import name blks2 **URL:** \ **Category:** GNU Radio\ **Created:** [July 2, 2014, 10:05pm UTC](https://www.ruby-forum.com/t/importerror-cannot-import-name-blks2/234790 "2014-07-02T22:05:36Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![addis\_a](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/c4cdca/32.png) [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Post date:** [July 2, 2014, 10:05pm UTC](https://www.ruby-forum.com/t/importerror-cannot-import-name-blks2/234790/1 "2014-07-02T22:05:36Z")
Somewhat a NOOB to Python, USRP, GNURadio… and needing some help. I am getting the error (below) when I try to execute a Python xxx.py progam… ImportError: cannot import name blks2 Here is what I am trying to do. I am trying to run an installed OSMOCOM radio program xxx.py With examination… in the OSMOCOM xxx.py file… line #17 is trying to import a number of GNUradio and Python packages. Line #17 looks like: from gnuradio import gr, gru, eng\_notation, blks2, optfir I am running Ubuntu 14.04… I have done the following… 1. Installed the latest 3.7x GNUradio package 2. I want to run with a N210 USRP SDR… Installed the UHD driver from [Ettus.com](http://Ettus.com) ([http://ettus-apps.sourcerepo.com/redmine/ettus/projects/uhd/wiki](http://ettus-apps.sourcerepo.com/redmine/ettus/projects/uhd/wiki)) 3. Downloaded OSMOCOM code and built it from GitHub. After a while of Googling for answers… I have wound up here to post for help. From previous threads out on the internet, I feel like I just have a Python import problem… and really not a GNUradio, OSMOCOM, or USRP problem. So I am not going to go list specifics at this time on the \*\*\*.py file and GNUradio specifiics… From other threads my guess is that the problem lies in that I was missing a $PYTHONPATH env variable. The BLKS2 module is located in my /usr/lib/python2.7/dist-packages/grc\_gnuradio directory. I tried adding this $PYTHONPATH env variable, and to point to the specific directory… but the error still occurs. I do have other Python versions on the Linux machine, but no other env variable points to another version of Python. Would I have a Python install problem? However it is a fresh load of Ubuntu… so I would think this would have installed correctly in the default load of the OS. Should my $PYTHONPATH env variable contain more paths that just: ``` PYTHONPATH=/usr/lib/python2.7/dist-packages or PYTHONPATH=/usr/lib/python2.7/dist-packages/grc_gnuradio/blks2 ``` Any help would be greatly appreciated!! Thanks in advance. -kenhokie ---
**Author:** ![kscott](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/k/7993a0/32.png) [@kscott](https://www.ruby-forum.com/u/kscott)\ **Post date:** [August 25, 2014, 4:05pm UTC](https://www.ruby-forum.com/t/importerror-cannot-import-name-blks2/234790/2 "2014-08-25T16:05:13Z")
Hi Ken, It looks as though your message went down a black hole because it was sent via the [ruby-forum.com](http://ruby-forum.com) website and not the GNU Radio mailing list at [http://gnuradio.org/redmine/projects/gnuradio/wiki/MailingLists](http://gnuradio.org/redmine/projects/gnuradio/wiki/MailingLists) . The message is not in the official GNU Radio mailing list archive so was never sent to the actual list: > **[discuss-gnuradio (date)](https://lists.gnu.org/archive/html/discuss-gnuradio/2014-07/index.html)** I came across your post as I was getting the same error as you and Googled it. I have just modified uhd-tetra\_demod.py and cqpsk.py to make the uhd version work and the commit is available in the branch called ‘gr\_3.7.4\_compatibility’: [https://github.com/m0mik/osmo-tetra/tree/gr\_3.7.4\_compatibility](https://github.com/m0mik/osmo-tetra/tree/gr_3.7.4_compatibility) List of files changed: [https://github.com/m0mik/osmo-tetra/commit/5429a1e3abf3e5c1aeadc0253169233faee46cc8](https://github.com/m0mik/osmo-tetra/commit/5429a1e3abf3e5c1aeadc0253169233faee46cc8) Mike Ken Smith wrote in post #1151491: > Somewhat a NOOB to Python, USRP, GNURadio… and needing some help. > > I am getting the error (below) when I try to execute a Python xxx.py > progam… > ImportError: cannot import name blks2 > > Here is what I am trying to do. I am trying to run an installed OSMOCOM > radio program xxx.py > > With examination… in the OSMOCOM xxx.py file… line #17 is trying to > import a number of GNUradio and Python packages. > > Line #17 looks like: > from gnuradio import gr, gru, eng\_notation, blks2, optfir > > I am running Ubuntu 14.04… > I have done the following… > > 1. Installed the latest 3.7x GNUradio package > 2. I want to run with a N210 USRP SDR.. Installed the UHD driver from > [Ettus.com](http://Ettus.com) > ([http://ettus-apps.sourcerepo.com/redmine/ettus/projects/uhd/wiki](http://ettus-apps.sourcerepo.com/redmine/ettus/projects/uhd/wiki)) > 3. Downloaded OSMOCOM code and built it from GitHub. > > After a while of Googling for answers… I have wound up here to post > for help. > > From previous threads out on the internet, I feel like I just have a > Python import problem… and really not a GNUradio, OSMOCOM, or USRP > problem. So I am not going to go list specifics at this time on the > \*\*\*.py file and GNUradio specifiics… > > From other threads my guess is that the problem lies in that I was > missing a $PYTHONPATH env variable. > > The BLKS2 module is located in my > /usr/lib/python2.7/dist-packages/grc\_gnuradio directory. > > I tried adding this $PYTHONPATH env variable, and to point to the > specific directory… but the error still occurs. > > I do have other Python versions on the Linux machine, but no other env > variable points to another version of Python. > > Would I have a Python install problem? However it is a fresh load of > Ubuntu.. so I would think this would have installed correctly in the > default load of the OS. > > Should my $PYTHONPATH env variable contain more paths that just: > > ``` > PYTHONPATH=/usr/lib/python2.7/dist-packages > or > PYTHONPATH=/usr/lib/python2.7/dist-packages/grc_gnuradio/blks2 > > ``` > > Any help would be greatly appreciated!! Thanks in advance. > > -kenhokie