[SOLVED] Python noob question

grail · 03-07-2010, 11:42 PM

I have installed a new module for Python (pycrypto) and when I run
the following:

python -c "import Crypto.Random"

I receive the error:

ImportError: No module named OSRNG

Now in the __init__.py file is - import OSRNG (obviously the offending line)

My question is: Are you able to import simply the module required by name if it exists as part of the module you have called or is Python looking up some kind of table / list that may have not been updated with the fact that OSRNG exists?

Cheers in advance
Grail

pgpython · 03-08-2010, 03:02 AM

Python will first look in the current working directory and then in the paths specified by sys.modules. Any modules you install should be installed in the site-packages directory of the python installation. I have never used pycrypto so I don't know what it's dependecies but it looks like your missing the OSRNG module from your python installation

grail · 03-08-2010, 06:24 AM

Ok ... so that was kind of what I thought, but am happy for the clarification.

The path to Random is:

/usr/lib/python3.1/site-packages/Crypto/Random

below this are the following:

random.py and __init__.py (as well as corresponding pyc files) plus the OSRNG directory

Therefore, I would assume that it should find OSRNG module which is being called from the __init__.py
of Random???

Colour me confused

pgpython · 03-08-2010, 10:06 AM

Having a closer look at PyCrypto reveals that OSRNG is a package of PyCrypto and should be in site-packages/Crypto/Random so I don't think you have a complete install of PyCrypto. If you reinstall it using your distros pacakge manager then it should fix the issue

grail · 03-08-2010, 07:46 PM

Well I tried that but to no avail

Can I confirm that what we have been talking about is the same for both Python 2.X and Python 3.x?

Also, I have run some small crypto scripts with other parts of the module and these seem to work ok

Edit: It appears there were some compile issues which couldn't be seen straight away.
Thanks for the assist.

kathar · 01-22-2014, 08:16 AM

Hi Grail,

Kindly add the solution on how you fix this issue.
Currently I am facing the same with import Crypto.Random

grail · 01-23-2014, 07:21 AM

Hi kathar, unfortunately being so old this post is not particularly relevant anymore as both Python and Pycrypto have undergone several updates in this time.

My suggestion would be to contact the pycrypto guys, as I found them all very helpful, and they should be able to assist.

As for my solution, as mentioned I found compile issues in the pycrypto source but currently I am at a loss to remember exactly what they were (sorry)