libblas.so cannot open share project file in python?

I'm a complete newbie with regards to this so please excuse my ignorance.

I wanted to run the benchmark from this question:

Benchmarking (python vs. c++ using BLAS) and (numpy)

The code can be found here: https://github.com/zed/woltan-benchmark/

after running make I get the following error.

Traceback (most recent call last):
  File "main.py", line 8, in <module>
    _blaslib = ctypes.cdll.LoadLibrary("libblas.so")
  File "/usr/lib/python2.7/ctypes/__init__.py", line 443, in LoadLibrary
    return self._dlltype(name)
  File "/usr/lib/python2.7/ctypes/__init__.py", line 365, in __init__
    self._handle = _dlopen(self._name, mode)
OSError: libblas.so: cannot open shared object file: No such file or directory
make: *** [Test.csv] Error 1

I'm guessing that it can't find the libblas.so library, but no idea where it is? How can I check if it's installed? I'm running Ubuntu 13.10.

Thanks you

ADDITIONAL INFO:

The python code triggering the error found in main.py is:

import ctypes
from ctypes import byref, c_char, c_int, c_float
import numpy
import os
import subprocess
import timeit

_blaslib = ctypes.cdll.LoadLibrary("libblas.so")

def Mul(m1, m2, i, r):

    no_trans = c_char("n")
    n = c_int(i)
    one = c_float(1.0)
    zero = c_float(0.0)

    _blaslib.sgemm_(byref(no_trans), byref(no_trans), byref(n), byref(n), byref(n), byref(one), m1.ctypes.data_as(ctypes.c_void_p), byref(n), 
                                                                                                m2.ctypes.data_as(ctypes.c_void_p), byref(n), byref(zero),
                                                                                                r.ctypes.data_as(ctypes.c_void_p), byref(n))

if __name__ == '__main__':

    rNumpy = []
    rBlas = []

    p = subprocess.Popen("./bench {0}".format(str([x for x in range(5, 501, 5)])[1:-1]), shell = True)
    os.waitpid(p.pid, 0)

    for i in range(20, 501, 20):
        m1 = numpy.random.rand(i,i).astype(numpy.float32)
        m2 = numpy.random.rand(i,i).astype(numpy.float32)

        tNumpy = timeit.Timer("numpy.dot(m1, m2)", "import numpy; from __main__ import m1, m2")
        rNumpy.append((i, tNumpy.repeat(20, 1)))

        r = numpy.zeros((i,i), numpy.float32)
        tBlas = timeit.Timer("Mul(m1, m2, i, r)", "import numpy; from __main__ import i, m1, m2, r, Mul")
        rBlas.append((i, tBlas.repeat(20, 1)))
        print i

    f = open("Test.csv", "w")

    for (i, n), (j, b) in zip(rNumpy, rBlas):
        f.write("{0} {1} {2} {3} ".format(i, sum(n)/len(n), min(n), max(n)))
        f.write("{0} {1} {2} {3}\n".format(j, sum(b)/len(b), min(b), max(b)))

    f.close()

EDIT 1:

After running locate libblas.so I replaced

_blaslib = ctypes.cdll.LoadLibrary("libblas.so")

with

_blaslib = ctypes.cdll.LoadLibrary("/usr/lib/libblas/libblas/libblas.so.3")

not sure if this is correct but it now the output looks like:

terminate called after throwing an instance of 'char const*'
Aborted (core dumped)