correlation matrix in python

Using numpy, you could use np.corrcoef:

In [88]: import numpy as np

In [89]: np.corrcoef([[0.1, .32, .2, 0.4, 0.8], [.23, .18, .56, .61, .12], [.9, .3, .6, .5, .3], [.34, .75, .91, .19, .21]])
Out[89]: 
array([[ 1.        , -0.35153114, -0.74736506, -0.48917666],
       [-0.35153114,  1.        ,  0.23810227,  0.15958285],
       [-0.74736506,  0.23810227,  1.        , -0.03960706],
       [-0.48917666,  0.15958285, -0.03960706,  1.        ]])