Yes, I attached an archive containing all the scripts. The main script that 
you need to run is "flowSolver.py". It starts out by requesting some manual 
input. This goes well, but immediately after that, I get the above error. 
In a terminal I did the following:

user@system:~$ cd Workspace/Spyder/SimpleCFDSolver/
user@system:~/Workspace/Spyder/SimpleCFDSolver$ sage
----------------------------------------------------------------------
| Sage Version 5.0.1, Release Date: 2012-06-10                       |
| Type notebook() for the GUI, and license() for information.        |
----------------------------------------------------------------------
sage: run flowSolver.py
Select flow case:
1: Uniform parallel flow
2: Poiseuille flow
3: Lid-driven cavity flow
4: Rotating flow
1
 
Input grid size:
40
 
Select linear system solving method:
1: Gaussian elimination
2: Conjugate gradient (CG)
3: Bi-conjugate gradient (BiCG)
1
 
Set linear system solver and solution residual tolerance:
-6
 
Set maximum allowable iterations:
1000

Thank you for your interest and feel free to ask for more details.

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Attachment: SimpleFlowSolver.tar.gz
Description: Binary data

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