桁を揃えて表示する (numpy.vectorize, numpy.around)

In [3]: coef
Out[3]: array([-0.68263528, -0.13848993, 0.89689266, -0.07576711])

In [4]: print vectorize("%.2f".__mod__)(coef)
['-0.68' '-0.14' '0.90' '-0.08']

In [5]: print around(coef,2)
[-0.68 -0.14 0.9 -0.08]