Simple MC in Python and NumPy

gistfile1.py

>>> import numpy
>>> a = numpy.random.random(1000000)
>>> n = 1000000
>>> a = numpy.random.random(n)
>>> b = numpy.random.random(n)
>>> a
array([ 0.13849378,  0.72228591,  0.49816557, ...,  0.08655529,
        0.02044737,  0.86337785])
>>> b
array([ 0.28050175,  0.05473387,  0.99651725, ...,  0.37804476,
        0.71068628,  0.11741604])
>>> result = a*a + b*b
>>> dartsInCircle = result[result <= 1.0]
>>> len(dartsInCircle)
785444
>>> n
1000000
>>> 4.0 * len(dartsInCircle)/n
3.141776