The specific error you're seeing is from not having PyQT installed. This package is the python bindings for the qt graphics library. I'm a little puzzled that the matplotlib installer will default to the QTAgg backend when a system does not have PyQT installed, but it looks like this is the way it is.

I could see two ways to fix this. Firs, you could try installing PyQT:

sudo apt-get install python-qt4

That should also install the SIP module and satisfy the ImportError you're seeing. There might be more packages you'll need after that so there might be further ImportErrors.

You could also try switching your matplotlib backend. You'll need to create a file named .matplotlibrc in your home folder (if it doesn't already exist), and add a line that looks like this:

backend : TkAgg

For more detail about matplotlib's configuration section, take a look at this: http://matplotlib.org/users/customizing.html

Cheers,

Nathan

On Tue, Sep 3, 2013 at 9:43 AM, Gary Foreman <gforema2@illinois.edu> wrote:

Hi Nathan,

Simply trying to run iyt produces the error. Here's a link with the error output I'm receiving http://pastebin.com/j11nKn58

Thanks for your help,
Gary

On Tue, Sep 3, 2013 at 11:25 AM, Nathan Goldbaum <nathan12343@gmail.com> wrote:

Hi Gary,

I don't think I've seen this before.

Can you paste the a small script that triggers this, along with the full traceback you get when the script errors out?

Cheers

Nathan

On Monday, September 2, 2013, Gary Foreman wrote:

Hello,

Suddenly my yt distribution seems to be broken because it cannot find the module sip. Sip appears to be a python/C interface that is called by matplotlib.pyplot. I have tried a few things to resolve the issue, none of which have worked. I've tried: yt update --all, pip install sip, and apt-get install yt using the repository mentioned on the Get YT page. pip install and apt-get install fail for separate reasons, which I can explain in a future email if necessary.

Since first encountering this problem, I have updated my OS because I realized I was using an outdated version of Ubuntu. I am now running Ubuntu 12.4 LTS. The OS update did not resolve the issue.

It seems worth mentioning that the default system python distribution is working fine and I am able to import pyplot as well as sip without a problem. During a quick search of the yt distribution, I did not find the same sip related files that I have in my system's python distribution.

Also, as of Friday, things are working fine with the yt distribution I have on my Mac laptop.

Thanks very much in advance for your help. Please let me know if you would like me to post some of the error messages I have received from the few solutions that I've tried.

Gary

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