title: Consistently create same random numpy array
body: <p>I am waiting for another developer to finish a piece of code that will return an np array of shape (100,2000) with values of either -1,0, or 1.</p>
  
  <p>In the meantime, I want to randomly create an array of the same characteristics so I can get a head start on my development and testing. The thing is that I want this randomly created array to be the same each time, so that I'm not testing against an array that keeps changing its value each time I re-run my process.</p>
  
  <p>I can create my array like this, but is there a way to create it so that it's the same each time. I can pickle the object and unpickle it, but wondering if there's another way.</p>
  
  <pre><code>r = np.random.randint(3, size=(100, 2000)) - 1
  </code></pre>