Re: Cannot find a module

From: Work <no email>
Date: Tue, 19 Aug 2014 10:20:56 -0500

Hi Ya,

When you execute it, do check that you are using the home directory since this is the only one shared by all modes and master by default.

Also, I notice you use iron python. To simplify things, can you run using sshmaster and sshnode. This may give you additional indication on what is going on.

I am unsure of a solution, yet these seem reasonable steps to check.

I hope this helps narrow down the issue.

              Jacob



Sent from my iPhone

On Aug 18, 2014, at 2:49 PM, Ya Xue <yxue_at_measinc.com> wrote:

> Hi,
>
> I have a script that needs to import a module and the module name is given as an input parameter. It works well on a local machine but generates “ImportError” with StarCluster. Here is a simple script that can reproduce the error:
>
> error.py:
>
> def imp(fname):
> if fname[-3:] == '.py':
> fname = fname[:-3]
> exec('import ' + fname + ' as params')
> print params.alpha
> f = open(fname+'_alpha.txt', 'w')
> f.write('%f' % params.alpha)
> f.close()
>
> If I run it on the StarCluster master, no problem:
>
> In [1]: run error.py
>
> In [3]: imp('p1.py')
> 1
>
> However, on the cluster:
>
> In [4]: from IPython.parallel import Client
>
> In [5]: c = Client()
>
> In [6]: v = c[:]
>
> In [7]: files = ['p1.py','p2.py','p3.py']
>
> In [8]: r = v.map(imp, files)
>
> In [9]: r[0]
> [0:apply]:
> ---------------------------------------------------------------------------
> ImportError Traceback (most recent call last)<string> in <module>()
> /home/ya/Code/error.py in imp(fname)
> 4 if fname[-3:] == '.py':
> 5 fname = fname[:-3]
> ----> 6 exec('import ' + fname + ' as params')
> 7 print params.alpha
> 8 f = open(fname+'_alpha.txt', 'w')
> <string> in <module>()
> ImportError: No module named p1
>
> Does anyone know how to fix it?
>
> Thanks,
> Ya
>
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> <p3.py>
> <p2.py>
> <p1.py>
> <error.py>
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Received on Tue Aug 19 2014 - 11:21:00 EDT