title: Matlab long format in python
body: <p>I need to implement a filter </p>
  
  <pre><code>EDA_T = signal.lfilter(b, a, edat);
  </code></pre>
  
  <p>in python with the coefficent:</p>
  
  <pre><code>a=np.array([1, -1.994372768943081, 0.99438855043802943], type=np.float64);    
  b=np.array([1, 1.9, 1.7])/3e5;
  </code></pre>
  
  <p>it is important to take all decimal number.
  With the specified type the array are:</p>
  
  <pre><code> print('a, b: ', a, b)
   a, b:  [ 1.         -1.99437277  0.99438855] [  3.33333333e-06       6.33333333e-06   5.66666667e-06]
  </code></pre>
  
  <p>some number are cutted.
  In matlab specifying the format long there is not any problem.
  How can I implement this in python?</p>