# ImportError: No module named **URL:** \ **Category:** GNU Radio\ **Created:** [July 23, 2014, 1:36pm UTC](https://www.ruby-forum.com/t/importerror-no-module-named/231136 "2014-07-23T13:36:31Z")\ **Posts on this page:** 8\ **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 23, 2014, 1:36pm UTC](https://www.ruby-forum.com/t/importerror-no-module-named/231136/1 "2014-07-23T13:36:31Z")
Hi all, I have created a new module called Tool\_NetworkCoding. During the installation, I did not get any error message, everything went well. But when I run a grc file to test some blocks inside this new module, it turned out an error message: _Traceback (most recent call last): File “/home/van-ly/Downloads/top\_block.py”, line 16, in import Tool\_NetworkCodingImportError: No module named Tool\_NetworkCoding_ Please help me with this. Thank you in advance Van-Ly Nguyen Van-Ly, Vietnam National University, Hanoi - VNU University of Engineering and Technology - UET Faculty of Electronics and Telecommunications - FET Tel: +84 978 819 406 Standing on my own two feet !!! ---
**Author:** ![NguySSSn\_VSSn\_LS\_S](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/n/9fc29f/32.png) [@NguySSSn\_VSSn\_LS\_S](https://www.ruby-forum.com/u/NguySSSn_VSSn_LS_S)\ **Post date:** [July 23, 2014, 1:49pm UTC](https://www.ruby-forum.com/t/importerror-no-module-named/231136/2 "2014-07-23T13:49:36Z")
Hi Van-Ly, if you installed everything correctly, Python should be able to find the module. You can verify this by looking at the install\_manifest.txt in your OOT’s build/ directory, in which there should be an entry for every file it copied. Find your python files (there always should be an **init**.py) and check if the target location is part of your $PYTHONPATH. Greetings, Marcus ---
**Author:** ![NguySSSn\_VSSn\_LS\_S](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/n/9fc29f/32.png) [@NguySSSn\_VSSn\_LS\_S](https://www.ruby-forum.com/u/NguySSSn_VSSn_LS_S)\ **Post date:** [July 23, 2014, 4:33pm UTC](https://www.ruby-forum.com/t/importerror-no-module-named/231136/3 "2014-07-23T16:33:58Z")
Hi Marcus, I’ve gotten a surprising thing and I couldn’t explain why. First, I type: sudo gnuradio-companion to open the GNUradio and test my own module. It turned out an error message as I described in the previous mail. (ImportError: No module named Tool\_NetworkCoding) However, when I just type: gnuradio-companion and also run the same grc file, the error message disappeared, and everything then seems to go well. So, is there any difference between _sudo gnuradio-companion_ and _gnuradio-companion_ ? Thank you very much Van-Ly Nguyen Van-Ly, Vietnam National University, Hanoi - VNU University of Engineering and Technology - UET Faculty of Electronics and Telecommunications - FET Tel: +84 978 819 406 On Wed, Jul 23, 2014 at 6:47 PM, Marcus Müller [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) ---
**Author:** ![NguySSSn\_VSSn\_LS\_S](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/n/9fc29f/32.png) [@NguySSSn\_VSSn\_LS\_S](https://www.ruby-forum.com/u/NguySSSn_VSSn_LS_S)\ **Post date:** [July 23, 2014, 4:41pm UTC](https://www.ruby-forum.com/t/importerror-no-module-named/231136/4 "2014-07-23T16:41:56Z")
On Wed, Jul 23, 2014 at 10:32 AM, Nguyễn Văn Lý [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > Thank you very much > Van-Ly Yes. Using sudo, you’re running as root with root’s environment that usually doesn’t know about things in /usr/local (PATH, PYTHONPATH, LD\_LIBRARY\_PATH, etc.). You should not be running gnuradio-companion as root, anyways. No need to sudo everything! Tom ---
**Author:** ![NguySSSn\_VSSn\_LS\_S](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/n/9fc29f/32.png) [@NguySSSn\_VSSn\_LS\_S](https://www.ruby-forum.com/u/NguySSSn_VSSn_LS_S)\ **Post date:** [July 23, 2014, 4:44pm UTC](https://www.ruby-forum.com/t/importerror-no-module-named/231136/5 "2014-07-23T16:44:49Z")
Hi Van-Ly, So, is there any difference between _sudo gnuradio-companion_ and _gnuradio-companion_ ? Yes, the “sudo” part 😉 sudo is used to make a program run under a different user, and in a different environment. For example, sudo gnuradio-companion runs gnuradio-companion as root. Why did you do that? But that doesn’t set the PYTHONPATH environment, so python can’t find the modules you installed to your local python package prefix. Greetings, Marcus ---
**Author:** ![NguySSSn\_VSSn\_LS\_S](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/n/9fc29f/32.png) [@NguySSSn\_VSSn\_LS\_S](https://www.ruby-forum.com/u/NguySSSn_VSSn_LS_S)\ **Post date:** [July 23, 2014, 4:52pm UTC](https://www.ruby-forum.com/t/importerror-no-module-named/231136/6 "2014-07-23T16:52:48Z")
Thanks Tom and Marcus, So it’s not necessary to run sudo gnuradio-companion at all 🙂 Van-Ly p/s: I am new to almost everything that I’m working with, from ubuntu to gnuradio 🙂 just glad to talk to you 🙂 Nguyen Van-Ly, Vietnam National University, Hanoi - VNU University of Engineering and Technology - UET Faculty of Electronics and Telecommunications - FET Tel: +84 978 819 406 On Wed, Jul 23, 2014 at 9:43 PM, Marcus Müller [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) ---
**Author:** ![NguySSSn\_VSSn\_LS\_S](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/n/9fc29f/32.png) [@NguySSSn\_VSSn\_LS\_S](https://www.ruby-forum.com/u/NguySSSn_VSSn_LS_S)\ **Post date:** [July 23, 2014, 5:00pm UTC](https://www.ruby-forum.com/t/importerror-no-module-named/231136/7 "2014-07-23T17:00:05Z")
Glad to have you here, too! Just a word of advice: this is not a linux support channel. We really like being helpful, so it’s ok to ask things related to GNU Radio and the system it runs on, but if you want linux help, you might want to go online in IRC and join the #ubuntu channel on [irc.freenode.org](http://irc.freenode.org) , using either a desktop client of your choice (e.g. Pidgin) or the web client at [http://webchat.freenode.net/](http://webchat.freenode.net/) Greetings, Marcus ---
**Author:** ![NguySSSn\_VSSn\_LS\_S](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/n/9fc29f/32.png) [@NguySSSn\_VSSn\_LS\_S](https://www.ruby-forum.com/u/NguySSSn_VSSn_LS_S)\ **Post date:** [July 23, 2014, 5:05pm UTC](https://www.ruby-forum.com/t/importerror-no-module-named/231136/8 "2014-07-23T17:05:08Z")
Thanks a lot Marcus 🙂 Nguyen Van-Ly, Vietnam National University, Hanoi - VNU University of Engineering and Technology - UET Faculty of Electronics and Telecommunications - FET Tel: +84 978 819 406 On Wed, Jul 23, 2014 at 9:58 PM, Marcus Müller [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid)